Why Is It So Hard for Some Scientists to Believe in God? Science vs Faith

Why Do Scientists Find It Hard to Believe in God? Science, Faith and Evidence Explained

Can someone spend their entire life studying the universe, discovering the secrets of DNA, exploring distant galaxies, and investigating the origins of life, yet still find it difficult to believe in God?

For some scientists, the answer is yes. Scientific training encourages people to question assumptions, examine evidence, test explanations, and change their conclusions when new evidence becomes available. Religious faith, on the other hand, often involves beliefs about God, spiritual experience, purpose, and questions that cannot easily be investigated through experiments.

But does studying science automatically make someone an atheist? Not at all.

Many scientists believe in God, follow religious traditions, or describe themselves as spiritual. Others are atheists or agnostics. Some see science and religion as compatible, while others believe that particular religious claims conflict with scientific evidence.

Geneticist Francis Collins, who led the Human Genome Project and served as director of the US National Institutes of Health, offers an interesting perspective. He argues that science primarily investigates how the natural world works, while faith and philosophy often explore questions about why we exist and whether life has a deeper purpose.

In an interview with Big Think, Collins explained that faith is asking a different set of questions from science.

So, why do some scientists struggle to believe in God? Is it because science contradicts religion, because religious beliefs cannot be tested in a laboratory, or because scientists have different standards for accepting something as true?

Let’s explore the science, philosophy, research, and arguments behind this fascinating debate.

Quick Answer: Why Is It Difficult for Some Scientists to Believe in God?

Some scientists find it difficult to believe in God because scientific methods rely on observable evidence, testable hypotheses, and explanations that can be examined or challenged. Many religious claims about God, creation, purpose, and the supernatural are not directly testable using these methods.

Scientific discoveries have also replaced some traditional supernatural explanations of natural phenomena with evidence-based explanations. For example, modern biology explains the diversity of life through evolution, genetics, and natural selection.

However, science does not automatically prove or disprove the existence of God. Some scientists are religious, some are atheists, and others are agnostic. Their conclusions often depend on how they interpret scientific evidence, philosophical arguments, personal experiences, and religious beliefs.

Science Depends on Evidence, Testing and Observation

One important reason some scientists struggle with religious belief is the way science works.

Science is a systematic way of understanding the natural world. Scientists observe phenomena, develop hypotheses, collect evidence, conduct experiments, and evaluate whether their explanations are supported by the results.

A scientific explanation should be open to testing, criticism, and revision.

For example, if a scientist wants to understand how diseases spread, they investigate microorganisms, genetics, environmental conditions, and patterns of transmission. They do not simply accept an explanation because it has been passed down through generations.

The same approach applies to physics, chemistry, astronomy, and biology.

This evidence-based approach has produced remarkable discoveries, from the development of vaccines to the discovery of gravitational waves and the sequencing of the human genome.

The National Academies of Sciences describes science as using evidence to construct testable explanations and predictions about natural phenomena.

Why does this create a challenge for religious belief?

Many religious beliefs involve ideas that cannot be directly measured or tested using conventional scientific methods.

For example:

• Does God exist beyond the physical universe?
• Is there a spiritual purpose behind human existence?
• Does a soul continue after death?
• Why does the universe exist at all?

These are important philosophical and theological questions, but they are not necessarily scientific questions.

A scientist may therefore ask: What evidence would allow me to test this claim? What observation could show that it is wrong?

If a religious claim does not produce testable predictions, the scientific method cannot establish it in the same way that it establishes a physical or biological explanation.

That does not automatically make the claim false. It means that the claim falls outside the direct reach of ordinary scientific investigation.

Science Cannot Directly Test Every Claim About God

One of the biggest misunderstandings in the science-versus-religion debate is the idea that science can prove or disprove everything.

It cannot.

Scientific investigation is designed to study natural phenomena. It relies on observations, measurements, experiments, and explanations that can be evaluated using evidence.

This approach is sometimes called methodological naturalism.

It means that scientists seek natural explanations when investigating how nature works. It does not necessarily mean that every scientist believes that only the natural world exists.

For example, a physicist investigating the movement of planets uses gravitational laws and mathematical models. A biologist studying the development of an organism investigates genes, cells, evolution, and environmental influences.

Neither scientist needs to introduce a supernatural explanation to conduct the investigation.

However, this methodological rule is different from philosophical naturalism, which is the broader worldview that reality contains nothing beyond the natural world.

A scientist can follow methodological naturalism while remaining religious.

Can science prove or disprove the existence of God?

The existence of God, understood as a supernatural or ultimate reality beyond the observable universe, is not a straightforward experimental question.

Science can investigate particular claims that have observable consequences. For example, researchers can study claims about the physical age of Earth, biological evolution, the effects of prayer, or alleged miraculous events when evidence is available.

But proving or disproving every possible conception of God is a much broader philosophical question.

The National Academies explain that science can neither prove nor disprove religion as a whole. Scientific discoveries can challenge particular religious interpretations, but many theological beliefs are not directly within the domain of scientific testing.

Scientific Discoveries Have Replaced Some Traditional Religious Explanations

Throughout history, people have used religious or supernatural explanations to understand many natural events.

Before modern scientific knowledge, people often connected diseases, natural disasters, astronomical events, and unusual weather patterns with spiritual forces.

As science developed, researchers discovered natural processes that explain many of these phenomena.

For example:

These discoveries demonstrate the power of scientific investigation.

Some scientists become skeptical of religious explanations when they see natural processes explaining phenomena that were previously attributed to supernatural intervention.

However, there is an important distinction here.

Explaining how a natural process works does not necessarily settle the philosophical question of why the universe exists or whether it has an ultimate purpose.

For example, explaining how stars form does not automatically answer why physical laws exist in the first place.

Scientific explanations can replace inaccurate explanations of natural events without necessarily resolving every question about existence.

Evolution and Genetics Challenge Some Religious Interpretations

Evolution is one of the most important areas where science and religious belief have historically come into conflict.

Charles Darwin’s theory of evolution by natural selection changed how scientists understand the diversity of life.

Modern genetics, fossil discoveries, comparative anatomy, and molecular biology provide extensive evidence that living organisms share common ancestry and have changed over millions of years.

DNA research has provided especially powerful evidence for evolutionary relationships between species.

This scientific understanding can conflict with religious interpretations that insist every species was created separately in its present form or that Earth is only a few thousand years old.

What did Francis Collins discover through genetics?

Francis Collins is a physician-geneticist who led the international Human Genome Project, which produced a reference sequence of human DNA in 2003.

His research helped advance the understanding of inherited diseases, human genetics, and the molecular basis of life.

Interestingly, Collins did not interpret his discoveries as evidence against God.

He accepted Darwinian evolution, including common ancestry and natural selection, while maintaining his Christian faith.

In the interview that inspired this article, Collins explained that genetics provides answers to questions about how living things developed, but he still considers the broader question of why the universe and life exist to be a separate philosophical matter.

His position demonstrates that accepting evolution does not automatically require rejecting religious faith.

The National Human Genome Research Institute’s biography of Francis Collins describes his contributions to genetics and leadership of the Human Genome Project.

Does evolution disprove God?

No. Evolution is a well-supported scientific explanation for the diversity and development of life. It does not, by itself, establish or disprove the existence of a creator.

Some religious groups reject evolution because they interpret their creation accounts literally. Others accept evolution as the natural process through which life developed.

The National Academies explicitly recognize that many religious people and scientists accept both biological evolution and religious faith.

The disagreement is often about how particular religious texts should be interpreted, rather than whether scientific evidence for evolution exists.

Scientists Often Ask for Evidence That Can Be Independently Checked

Scientists are trained to be cautious about accepting extraordinary claims.

A scientific claim becomes more convincing when it is supported by reproducible observations, independent investigations, reliable measurements, and evidence that other researchers can evaluate.

This does not mean scientists are incapable of believing something they cannot personally observe.

For example, scientists accept the existence of black holes, distant planets, atoms, and subatomic particles based on indirect but measurable evidence.

The important point is that these ideas produce observable consequences that can be investigated.

Religious claims are often different.

Belief in God may be based on philosophical arguments, religious teachings, personal experiences, spiritual traditions, or a combination of these.

These sources of belief are not necessarily the same as scientific evidence.

For some scientists, this difference creates an intellectual difficulty. They may feel uncomfortable accepting a claim that cannot be investigated using the methods they trust in their professional lives.

Others believe that different types of questions require different methods of reasoning.

Is faith the opposite of evidence?

Not necessarily.

Religious faith can involve trust, philosophical reasoning, personal experience, historical arguments, and interpretations of the natural world.

However, faith alone does not establish a scientific explanation.

Similarly, scientific conclusions should not be accepted simply because a respected person says they are true. They must be supported by evidence and remain open to examination.

The two approaches can overlap in people’s lives, but they do not use identical standards of justification.

The Problem of Suffering and Evil Can Challenge Religious Belief

The difficulty of believing in God is not always related to scientific evidence.

Some scientists, like other people, also struggle with philosophical and moral questions.

One of the most familiar is the problem of evil.

If God is all-powerful, all-knowing, and perfectly good, why do innocent people experience terrible suffering?

Why do children develop serious diseases? Why do earthquakes, floods, and other natural disasters kill thousands of people? Why do diseases, conflicts, and extreme hardships exist?

These questions can make belief in an all-loving and all-powerful God difficult for some people.

Scientists may approach these problems through biology, medicine, psychology, geology, and other disciplines. Their professional knowledge can make them particularly aware of the scale and complexity of suffering in nature.

For example, a medical researcher may spend years studying genetic diseases. A physician may regularly encounter patients facing severe illness. A biologist may investigate parasites that harm their hosts.

Scientific explanations can help us understand how these problems occur, but they do not automatically answer why such suffering should exist.

Religious philosophers and theologians have developed different responses, including arguments about free will, moral development, natural laws, and the limitations of human understanding.

Some people find these explanations convincing. Others do not.

This is a philosophical and theological debate rather than a question that scientific experiments alone can settle.

Some Scientists Believe Science and Religion Are in Conflict

Another reason some scientists find faith difficult is the historical and modern conflict between certain religious interpretations and scientific discoveries.

This tension becomes especially visible when religious institutions or influential religious figures reject established scientific findings.

Examples include:

• Denying the scientific evidence for biological evolution.
• Rejecting the well-established age of Earth.
• Opposing particular areas of medical research on religious grounds.
• Treating religious texts as scientific explanations of natural phenomena.
• Presenting supernatural claims as replacements for testable scientific explanations.

These disagreements can make scientists feel that religious belief threatens scientific independence.

The conflict can also work in the opposite direction.

Some outspoken atheists argue that science is the only legitimate way to understand reality and that religious or philosophical questions have no value unless they can be tested scientifically.

This broader position is sometimes described as scientism. It goes beyond the practical scientific method and makes a philosophical claim about what kinds of knowledge matter.

Francis Collins has criticized both extremes. He argues that some religious people treat science as an enemy, while some atheists use scientific authority to dismiss every question that cannot be answered through experimentation.

His view is that scientific and religious discussions become more productive when neither side claims authority over every aspect of human understanding.

Scientific Culture and Social Pressure Can Influence Religious Scientists

A scientist’s professional environment can also shape how openly they discuss religious belief.

In some academic settings, scientists may feel that expressing faith could lead colleagues to question their objectivity or intellectual credibility.

Others may avoid discussing religion because they see it as a personal matter unrelated to their research.

A 2024 feature in Nature examined how religious scientists balance faith and professional life. It drew on the work of sociologist Elaine Howard Ecklund, whose research has involved more than 40,000 surveys and nearly 2,500 confidential interviews over two decades.

The article reported that religious scientists are more common than many people assume and that some researchers feel uncomfortable discussing faith in professional settings.

This highlights something important: a scientist’s public professional identity does not necessarily reveal their complete personal worldview.

Some scientists may be religious but prefer to keep their beliefs private. Others may have strong philosophical or atheistic convictions. Neither position can be assumed simply from someone’s scientific qualifications.

Do Scientists Actually Believe in God? What Research Reveals

It would be inaccurate to say that all scientists are atheists or that scientific education automatically removes religious belief.

Research shows that scientists’ religious identities vary across countries, cultures, disciplines, and personal backgrounds.

What did the 2009 Pew Research survey find?

A 2009 survey by the Pew Research Center examined members of the American Association for the Advancement of Science (AAAS).

It found that:

• 33% of the surveyed scientists said they believed in God.
• 18% believed in a universal spirit or higher power.
• 41% said they did not believe in God or a higher power.
• 48% identified as having no religious affiliation.

The same report noted that scientists in the surveyed group were less likely to express religious belief than the general American public.

However, these figures are from a US survey conducted in 2009. They should not be presented as the current percentage of religious scientists worldwide.

You can read the original Pew Research Center report on scientists and belief.

What did international research find about scientists’ religious beliefs?

A larger international research project published in Socius in 2016 examined biologists and physicists across eight regional contexts: France, Hong Kong, India, Italy, Taiwan, Turkey, the United Kingdom, and the United States.

The researchers received 9,422 completed responses from scientists. The survey was conducted in 2011–2012, so it offers an important international comparison rather than a current worldwide census.

Some interesting findings included:

The Indian result is particularly interesting. Although 94% of surveyed Indian scientists identified with a religious tradition, 59% described themselves as at least slightly religious.

This distinction matters because religious affiliation does not always mean strong personal belief or regular religious practice.

The researchers also found that scientists in India, Italy, Taiwan, and Turkey were more likely to describe themselves as religious than scientists in some Western regions.

Do most scientists think science and religion are enemies?

Interestingly, the same international study found that most surveyed scientists did not describe science and religion as being in direct conflict.

When asked about their personal understanding of the relationship between science and religion, researchers found that the independence perspective was the most common response in each of the eight regions.

For example:

• 44% of surveyed Indian scientists viewed science and religion as independent.
• 29% viewed them as potentially collaborative.
• 18% described the relationship as a conflict in which they sided with science.

These results show that scientists have different ways of understanding the relationship between scientific research and religious belief.

The study also found substantial regional variation, demonstrating that professional scientific work does not necessarily produce the same religious attitudes everywhere.

Read the full research paper: Religion Among Scientists in International Context: A New Study of Scientists in Eight Regions.

Francis Collins: A Scientist Who Believes in God

One of the most interesting examples of someone combining scientific research with religious faith is Francis Collins.

Collins is a physician-geneticist who led the Human Genome Project, an international scientific effort to map and sequence human DNA. He later served as director of the US National Institutes of Health from 2009 to 2021.

Interestingly, Collins was not always religious.

According to an interview published by PBS, he described himself as an atheist during his early twenties. At the age of 27, after exploring philosophical and religious arguments, he became a Christian.

His experience is particularly interesting because his faith developed alongside a career deeply rooted in scientific investigation.

How did genetics influence his belief in God?

Collins has explained that studying genetics strengthened his appreciation of the complexity and elegance of living organisms.

Modern biology reveals extraordinary details about DNA, genetic information, cellular processes, and the relationships between living species.

For Collins, these discoveries provide answers about how biological systems work while also inspiring philosophical questions about why life and the universe exist.

He has also discussed the remarkable properties of the physical laws and constants that allow complex structures to exist in the universe.

Some people interpret these features as suggestive of an underlying intelligence or creator. Others offer alternative philosophical explanations.

Importantly, the idea that physical constants point toward a creator is a philosophical or theological interpretation, not a scientific conclusion established by modern physics.

Does Collins reject evolution?

No.

Collins accepts evolution by natural selection and the scientific evidence for common ancestry.

He does not believe that accepting Darwinian evolution requires abandoning belief in God.

His perspective is that scientific discovery can explain the processes through which living things developed without necessarily resolving every philosophical question about existence.

In an interview with Big Think, he expressed the distinction between questions about how the natural world works and questions about why anything exists in the first place.

You can explore his original discussion in Why It’s So Hard for Scientists to Believe in God?.

Can Science and Religion Coexist?

The relationship between science and religion depends partly on what people mean by religion, what claims are being made, and how those claims relate to scientific evidence.

There are several broad ways to understand the relationship.

Conflict: Science and religion disagree

Some people believe science and religion make competing claims about reality.

For example, a literal interpretation of a religious creation account may conflict with geological evidence about Earth’s age or the scientific evidence supporting evolution.

In such situations, a specific religious interpretation may be inconsistent with established scientific knowledge.

Independence: They address different questions

Others argue that science and religion often focus on different aspects of human understanding.

Science investigates the natural world, while religion and philosophy explore questions such as purpose, meaning, morality, and spiritual experience.

This is close to Francis Collins’s position.

However, the distinction is not absolute. Religious traditions sometimes make claims about natural events, and science can investigate the observable parts of those claims.

Collaboration: They can influence one another

Some people believe scientific discovery can deepen their spiritual appreciation of the universe.

For example, learning about DNA, the scale of the cosmos, or the complexity of biological systems may inspire wonder and religious reflection.

Religious or philosophical traditions can also influence how individuals think about ethical responsibilities, human dignity, and the use of scientific discoveries.

Nevertheless, scientific claims still require scientific evidence, even when the people making them hold religious beliefs.

The important point is that science and religion do not have to be enemies, but they are not interchangeable methods of discovering facts about nature.

So, Does Science Make People Atheists?

No. There is no scientific rule that requires scientists to become atheists.

A scientist can be:

• Theist: Believes in God or gods.
• Atheist: Does not believe in God or gods.
• Agnostic: Believes that the existence of God is unknown or cannot be known, depending on the person’s understanding.
• Deist: Believes in a creator or originating intelligence but may not believe in ongoing divine intervention.
• Religious and scientifically trained: Accepts scientific evidence while also following a religious or spiritual tradition.

These positions can involve different philosophical arguments and personal experiences.

Scientific education may encourage critical thinking and a preference for evidence-based explanations. But people interpret the philosophical implications of scientific knowledge differently.

Some see the natural laws and complexity of the universe as reasons to believe in a creator. Others see no need to introduce God as an explanation. Still others remain uncertain.

Science can tell us a great deal about how the universe works. It does not automatically settle every question about what the universe ultimately means.

Frequently Asked Questions (FAQs)

Why do some scientists not believe in God?

Some scientists do not believe in God because they prefer explanations supported by observable evidence and testable hypotheses. Others find that religious claims lack sufficient evidence, conflict with their philosophical views, or raise difficult questions about suffering and the nature of existence. However, scientists hold a wide range of religious and nonreligious beliefs.

Does science prove that God does not exist?

No. Science does not establish that God does not exist. Scientific methods investigate natural phenomena through evidence and testing. While science can evaluate particular religious claims that have observable consequences, the broader philosophical question of God’s existence is not something that can be conclusively settled by ordinary scientific experiments.

Can a scientist believe in God?

Yes. Many scientists believe in God or follow religious traditions while conducting rigorous scientific research. Francis Collins, who led the Human Genome Project, is a prominent example of a scientist who accepts evolution and modern genetics while maintaining Christian faith.

Is there a conflict between science and religion?

There can be conflict when a religious interpretation contradicts well-established scientific evidence, such as the age of Earth or biological evolution. However, many scientists and religious people see science and faith as compatible or as addressing different kinds of questions.

Does evolution disprove God?

No. Evolution explains the development and diversity of life through natural processes supported by evidence from genetics, fossils, and other scientific fields. It challenges some literal creation interpretations, but it does not logically establish whether God exists.

Why did Francis Collins believe in God?

Francis Collins has described a personal and intellectual journey from atheism to Christianity at the age of 27. He has explained that his study of genetics and the complexity of biological life strengthened his sense of wonder and spiritual appreciation. His interpretation is personal and philosophical rather than a scientific proof of God’s existence.

Are most scientists atheists?

No. Scientists have diverse religious beliefs, and their views vary across countries and disciplines. A 2016 international study of biologists and physicists in eight regions found significant religious identification among scientists in several regions, including India, Turkey, Italy, and Taiwan.

What is the difference between scientific and religious knowledge?

Scientific knowledge is developed through observation, testing, evidence, and explanations of natural phenomena. Religious knowledge often involves faith, theology, spiritual experience, tradition, and philosophical reasoning. The two approaches use different methods and standards, although they may overlap when religious beliefs make claims about the natural world.

Can studying science increase religious belief?

For some people, yes. Studying the universe, genetics, and the complexity of life can inspire a sense of awe and lead them to philosophical or spiritual questions. Others interpret the same discoveries through nonreligious explanations. Scientific knowledge does not produce one universal religious conclusion.

Conclusion: Science Does Not Automatically Make Someone an Atheist

Why is it so hard for some scientists to believe in God?

The answer is not simply that science and religion are enemies. Scientific training emphasizes evidence, observation, and testable explanations, while many religious beliefs involve questions about God, spiritual experience, meaning, and purpose that cannot be investigated in the same way.

Scientific discoveries have challenged certain religious interpretations, particularly those that make claims about the natural world that contradict established evidence. However, they have not automatically eliminated religious belief.

Francis Collins demonstrates that a person can accept evolution, study the human genome, and maintain a religious worldview. Other scientists reach different conclusions, and their views deserve to be understood rather than reduced to stereotypes.

Ultimately, science is a powerful way to investigate how the natural world works, but the philosophical question of why anything exists is much broader than a laboratory experiment.

The most productive discussion is not about forcing science and religion into the same box. It is about respecting the role of evidence, recognizing the limits of different methods of inquiry, and allowing difficult questions to be discussed thoughtfully.