The Philosophy Behind Secularism
When we engage with secular people, we are not merely encountering the absence of religious belief but the presence of an alternative worldview. That worldview is naturalism—the philosophical position that nature is all that exists, that the physical universe is the whole of reality, and that supernatural or transcendent realms are either non-existent or unknowable.
Understanding naturalism is essential for meaningful dialogue with secular people. It is the water in which modern Western culture swims—often unexamined and taken for granted. By bringing naturalism's assumptions into the light, we can have deeper conversations about what is really at stake in the choice between secular and Christian worldviews.
Most secular people have never consciously adopted naturalism as a philosophy. They simply absorbed it from the culture—through education, media, and the general assumptions of modern life. Helping them see the worldview they've unconsciously adopted is often the first step toward genuine dialogue about ultimate questions.
Defining Naturalism
What Naturalism Claims
Naturalism (also called "philosophical naturalism" or "metaphysical naturalism") holds that:
- Only nature exists. The physical universe—matter, energy, space, and time—is the totality of reality. There is no supernatural realm, no spiritual dimension, no transcendent order beyond the physical.
- Everything is explicable through natural causes. All phenomena can, in principle, be explained by natural processes operating according to natural laws. No appeal to divine action, miracles, or supernatural intervention is necessary or warranted.
- Science is the privileged path to knowledge. The methods of natural science are the most reliable—perhaps the only reliable—means of gaining knowledge about reality. Other claimed sources of knowledge (revelation, religious experience, mystical insight) are suspect.
- Human beings are entirely natural. We are physical organisms, products of evolution, with no immaterial soul or spirit. Consciousness, morality, and religious experience are all explainable as products of brain activity shaped by natural selection.
Naturalism vs. Science
It's crucial to distinguish naturalism from science itself. Science, as a method, brackets supernatural explanations and investigates natural causes— this is methodological naturalism, and it's simply how science operates. But metaphysical naturalism goes further, claiming that natural causes are all there is—that the method's limitation reflects reality's boundaries.
Many scientists are not metaphysical naturalists. They use naturalistic methods in their work while believing in God, the soul, or other non-natural realities. The leap from "science doesn't study the supernatural" to "the supernatural doesn't exist" is a philosophical leap, not a scientific conclusion.
Many people assume naturalism is simply "what science has proven" or "the rational default." But naturalism is not a scientific conclusion—it's a philosophical premise that science cannot test. You cannot use the methods of natural science to determine whether anything exists beyond nature. The question is outside science's scope.
How Naturalism Became Dominant
The Scientific Revolution
The Scientific Revolution of the 16th-17th centuries, ironically begun largely by Christians who believed in an orderly creation, began to explain more and more phenomena through natural laws. As the scope of scientific explanation expanded, some began to wonder whether God was necessary at all.
The Enlightenment
The Enlightenment elevated reason and science as the supreme authorities, often in opposition to religious tradition. Thinkers like David Hume attacked miracles and religious knowledge, while others proposed that morality and society could be grounded without reference to God.
Darwin and After
Darwin's theory of evolution provided what seemed to be a naturalistic explanation for the appearance of design in living things—one of the strongest arguments for God's existence. As one scientist put it, Darwin made it possible to be an "intellectually fulfilled atheist." Evolutionary theory became the centerpiece of a naturalistic worldview.
The Twentieth Century
The 20th century saw naturalism become the default assumption in academia, particularly in the sciences but increasingly in humanities and social sciences as well. What was once a contested philosophical position became the unquestioned framework—the lens through which educated Westerners learned to see reality.
The Implications of Naturalism
Naturalism, consistently held, leads to some profound conclusions:
No God
If nature is all there is, there is no supernatural God. At most, "god" could refer to some impersonal force within nature—but not to the transcendent, personal Creator of Christian faith. Prayer is futile; providence is illusion; we are on our own in an indifferent universe.
No Soul
If only physical things exist, there is no immaterial soul. You are your brain— nothing more. When the brain dies, you cease to exist. Consciousness is an emergent property of neurons, not evidence of a spiritual dimension.
No Objective Meaning
If the universe was not created with purpose, it has no inherent meaning. We are accidents of evolution in an indifferent cosmos. Any "meaning" we experience is self-created—a psychological construction, not a discovery of something real.
No Objective Morality
If there is no God to ground moral truth, morality becomes subjective—either individual preference or social convention. Nothing is objectively right or wrong; there are only behaviors that societies approve or disapprove for pragmatic reasons.
No Miracles
If nature operates by inviolable laws with no supernatural intervention, miracles are impossible by definition. The resurrection of Jesus cannot have happened; it must be legend, hallucination, or deception.
No Life After Death
If we are entirely physical, death is the end. There is no heaven, no hell, no judgment, no resurrection. When the body dies, the person is gone forever.
"If in Christ we have hope in this life only, we are of all people most to be pitied."
— 1 Corinthians 15:19Problems with Naturalism
Naturalism faces serious philosophical difficulties that we can raise in conversation:
The Origin Question
Why does anything exist at all? Naturalism cannot explain why there is a universe rather than nothing. The Big Bang tells us how the universe developed, not why there was anything to go bang. The existence of contingent things points toward a necessary being—something naturalism cannot provide.
The Fine-Tuning Problem
The universe appears fine-tuned for life—physical constants calibrated within extraordinarily narrow ranges that permit complex chemistry and biology. Naturalism must attribute this to blind chance or multiply universes infinitely (the multiverse hypothesis)—both of which face serious objections.
The Consciousness Problem
How does consciousness arise from unconscious matter? Despite decades of research, we have no naturalistic explanation for subjective experience—the "hard problem of consciousness." Why should arrangements of atoms feel anything at all? This remains deeply mysterious on naturalistic assumptions.
The Reason Problem
If our cognitive faculties evolved for survival rather than truth, why should we trust them to give us accurate beliefs about reality—including beliefs about naturalism itself? Darwin himself worried: "Would anyone trust the convictions of a monkey's mind?" This is the problem of evolutionary self-defeat.
The Morality Problem
If naturalism is true, there is no objective morality—yet we cannot live as if morality is merely subjective. Our irrepressible moral convictions (that cruelty is wrong, that justice matters, that love is good) suggest that naturalism is missing something important about reality.
When engaging with secular people, help them see that naturalism is a philosophical position with serious problems—not an obvious truth or scientific conclusion. Ask questions: "How do you account for the existence of the universe? For consciousness? For your moral convictions?" These questions reveal the difficulties naturalism faces and open space for considering alternatives.
The Christian Alternative
Christianity offers a worldview that accounts for what naturalism cannot:
A Necessary Being
God is the necessary being who explains why anything exists. He is not part of the universe but its transcendent source—the answer to the question naturalism cannot address.
A Designed Cosmos
The fine-tuning of the universe reflects intentional design by an intelligent Creator who wanted life—and specifically human life—to exist.
Consciousness and Soul
Humans are not merely matter but bear God's image, possessing immaterial souls that account for consciousness, rationality, and moral awareness.
Reliable Reason
Our cognitive faculties were designed by a rational God to know truth. We can trust our minds because they reflect the mind of their Maker.
Objective Morality
Moral truth is grounded in God's character. Good and evil are real because they reflect who God is. Our moral intuitions are perceptions of genuine moral facts, not evolutionary accidents.
Hope Beyond Death
Because we have souls and God has promised resurrection, death is not the end. There is hope beyond the grave—judgment for those apart from Christ, eternal life for those who trust Him.
"For since the creation of the world God's invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse."
— Romans 1:20Paul's words suggest that the evidence for God's existence is available to all who have eyes to see. Naturalism is not the conclusion of honest inquiry but the suppression of truth that points to the Creator. Our task in evangelism is to help people see what they have been trained to ignore.
Discussion Questions
- What is the difference between methodological naturalism (how science works) and metaphysical naturalism (the claim that nature is all there is)? Why is this distinction important in conversations with secular people?
- Which problem for naturalism (origin, fine-tuning, consciousness, reason, morality) do you find most compelling? How might you raise it in conversation without being confrontational?
- Most secular people have never consciously examined their naturalistic assumptions. What questions could you ask to help them see the worldview they've unconsciously adopted and its implications?