Her name was Ms. Moon — an oddly poetic name for a science teacher. It was junior year at Argo High School in Summit, Illinois. She stood before our class, chalk in hand, hair pulled back with a kind of pragmatic determination that only a science teacher can have. She was good at her job. She knew her biology. She had the confidence of someone who believed she was telling the truth.
“Humans,” she said, “are animals.”
I remember sitting there thinking, She’s right. We are mammals, after all. We breathe, eat, reproduce, and eventually die. She wasn’t lying. But as the words landed in my young mind, something in me resisted. Yes, we are animals — but we are also more. To call us just animals felt like describing Shakespeare’s plays as a pile of ink stains on parchment. Technically true, but deep inside I felt my heart sink….she is missing something –I know it.
I did not know what was missing but I know now.
That was my first confrontation with the philosophy of naturalism, though I didn’t yet have the vocabulary for it. The claim that we are nothing but animals. That everything we are — our thoughts, our loves, our longings — could be reduced to the shuffling of atoms in an indifferent cosmos. Ms. Moon wasn’t being malicious; she was simply handing on the worldview she had inherited.
Naturalism, in its various academic guises, insists that the half is the whole. And it does so with an air of inevitability, as though anyone who questions it has already confessed to intellectual heresy. It presents itself as “science,” but like Ms. Moon’s declaration, it’s really more philosophy than fact.
What Exactly Is Naturalism?
Try to define naturalism and you’ll find yourself in a philosophical funhouse. Scholars argue over its meaning, and no single definition has gained universal acceptance. Robert Koons at the University of Texas describes it as the belief that “nothing can have any influence on events and conditions in space and time except other events and conditions in space and time.” Michael Rea, American analytic philosopher who is currently the Rev. John A. O'Brien Professor of Philosophy at the University of Notre Dame, calls it less a philosophy than a research program — essentially, a commitment to explain everything using the methods of natural science alone. David Armstrong, a highly influential Australian philosopher and a leading figure in metaphysics, boils it down to the doctrine that “reality consists of nothing but a single all-embracing spatio-temporal system.”
The common thread? Naturalism insists that if you can’t measure it, test it, and quantify it, it doesn’t count as real. Ghosts, angels, and souls might make for spooky campfire stories, but they have no place in serious inquiry. Richard Dawkins and Daniel Dennett –both leading atheists, go further: they simply deny such things exist.
Naturalism, then, is not science itself but a kind of philosophical bouncer at the door of science. It decides in advance who gets in and who doesn’t. Atoms? Welcome. Quarks? Come right in. Love, morality, beauty, God? Sorry — your name’s not on the list.
The Dogmatism of Naturalism
This is where the trouble begins. Naturalism presents itself as the champion of open inquiry, but in reality, it sets strict metaphysical boundaries: this far and no further. Anything that smells of purpose, design, or transcendence is ruled out before the evidence is even considered.
Karl Popper, the great philosopher of science, famously argued that for a theory to be scientific it must be falsifiable — capable of being proven wrong. If no possible evidence could disprove your theory, then your theory isn’t science; it’s dogma. By this standard, naturalism isn’t science at all. It’s a metaphysical straitjacket masquerading as science.
This is like playing chess where your opponent declares in advance: “I win, no matter what pieces remain on the board.” Call it clever if you like, but don’t call it a science.
Science and Its Limits
Science is a marvelous tool. It can split atoms and splice genes. It can put a man on the moon (Ms. Moon would appreciate that) and a rover on Mars. It can tell us the chemical composition of a star a billion light years away. But there are at least ten things science cannot do:
It cannot tell you why beauty moves you to tears, why justice matters, why you should not torture a child, why love is the most amazing thing, or why betrayal feels like death. It cannot tell you what ought to be; it can only describe what is. It cannot tell you the purpose of your life, or whether your life has any purpose at all.
Science can weigh your brain but not your thoughts. It can measure your heartbeat but not your heartbreak.
To confuse science with naturalism is to mistake a scalpel for the whole of medicine. Science is a tool. Naturalism is a worldview. And the two should not be conflated.
The Self-Defeating Nature of Naturalism
Here’s where things get really interesting. Naturalism claims that our minds are the accidental byproduct of blind evolutionary forces. Our thoughts, on this account, are not designed to track truth but to promote survival.
Think about that. If the primary function of your brain is not to discover what is true but simply to keep you alive long enough to reproduce, then why should you trust it to tell you the truth about naturalism itself?
This is the great irony: if naturalism is true, then the very cognitive faculties you use to arrive at that conclusion are unreliable. It’s like trusting a compulsive liar because he swears he’s telling the truth this time.
Richard Taylor once illustrated this with a thought experiment. Imagine you see a pile of stones by the side of the road spelling out the words: Welcome to Wales. If you thought that arrangement was the accidental result of wind and erosion, you would have no reason to trust it. The only reason you trust the sign is because you assume it was arranged by an intelligent agent with purpose. The same applies to our thoughts. If they are nothing but accidents of blind physical processes, then we have no reason to trust them either.
Consciousness: The Fly in Naturalism’s Beer
The scandal of naturalism is that it cannot account for the most obvious fact in the universe: your own awareness. Matter in motion explains billiard balls, not Beethoven.
John Searle the great philosopher of mind, himself, no friend of dualism, admitted that “to grant the existence and irreducibility of mental phenomena would be equivalent to granting some kind of Cartesianism.” Thomas Nagel a naturalist himself, sharpened the knife further: no amount of third-person description can ever capture the what it is like of subjective experience. Daniel Dennett tried to dismiss consciousness as a kind of magician’s trick, but when you have to deny the very evidence by which you know anything at all, you are like a man sawing off the tree branch while insisting he never believed in trees.
Think of it this way: if your laptop suddenly started weeping over the tragedy of Hamlet, you would not shrug and say, “Well, that’s just an emergent property of silicon.” You would suspect something alien has entered the machine. Yet naturalism insists that when you compose symphonies, write poetry, or fall in love, it is nothing more than atoms buzzing in the dark. That’s like saying Michelangelo’s David is nothing but dust arranged attractively. True, in the most boring sense possible. But woefully inadequate.
The Morality Problem
If naturalism is true, morality is a useful illusion—like a placebo pill evolution slipped into our psychology to keep the species from self-destructing. Richard Dawkins famously wrote that the universe has “no design, no purpose, no evil, no good, nothing but blind, pitiless indifference.” Nietzsche called it out with brutal honesty: if God is dead, we must create our own values.
But here’s the difficulty: no one can live like Nietzsche’s Übermensch. Even the most hardened relativist calls genocide wrong—not “socially inconvenient.” Imagine saying, “I like chocolate, you like vanilla, Hitler liked extermination.” That’s not moral reasoning; that’s nihilism wearing a cheap mask.
Alasdair MacIntyre observed that in a post-Enlightenment world, we keep the moral vocabulary (rights, dignity, justice) while gutting the metaphysical foundation that gave them meaning. Naturalism is like a man who saws the legs off his dining table, then is surprised when his dinner slides to the floor. Our shared human cry—this is evil, that is good—is a clue, a fingerprint of transcendence pressed into our moral consciousness. To reduce it to neurons or survival strategies is like reducing the Sistine Chapel ceiling to “pigment distribution.” Accurate but not remotely adequate.
Determinism and the Illusion of Freedom
Finally, freedom. If naturalism holds, determinism follows with all the inevitability of gravity. Every choice you make is just physics unfolding. Your decision to read this essay was baked into the Big Bang. You are not a chooser; you are a domino.
But here is the fatal paradox: if all beliefs are predetermined, then your belief in naturalism is not the result of rational evaluation. It was forced upon you by atoms colliding in your skull. Why trust an argument produced not by logic but by chemistry? Alvin Plantinga pressed this point with his Evolutionary Argument Against Naturalism: if naturalism were true, we would have no reason to trust our cognitive faculties, and therefore no reason to trust naturalism itself. That’s philosophy’s version of snake-eating-its-tail.
Freedom is the precondition of reason. To deny it is like denying the existence of air while giving a lecture. The very act of persuasion presupposes that the hearer could do otherwise—that she could weigh, judge, and freely assent. If all is determined, then even this sentence is not meant to persuade; it is just an echo of atoms, like the meaningless chattering of wind through leaves.
Naturalism may explain a great deal—but it cannot explain you. Consciousness, morality, and freedom are the “flies in its ointment,” buzzing annoyingly against the sterile glass jar of materialism. Swat them away, and you’ve swatted away the very things that make life worth living.
Naturalism’s Civilizational Consequences
Ideas have consequences. Naturalism is not just an ivory tower abstraction; it shapes culture.
If we are nothing but animals, then morality is just a herd instinct. If our thoughts are accidents, then truth is irrelevant. If freedom is an illusion, then responsibility is a joke. If beauty is just a trick of the brain, then art is meaningless.
This is not speculation. We see the results all around us: the epidemic of nihilism, the reduction of love to chemicals, the rise of consumerism as a substitute for transcendence, the inability of modern liberalism to ground human rights apart from the very Judeo-Christian framework it rejects.
Charles Taylor calls this the “social imaginary” of a secular age. We pretend to occupy a neutral epistemic space, where reason alone dictates belief. But this supposed neutrality is itself a competing ideology — one that functions more like a rival religion than like an impartial referee.
A Universe Without Purpose
At its core, naturalism is the death of telos — the idea of purpose.
The Greek philosophers believed everything had a telos: the acorn’s telos is the oak, the bow’s telos is to shoot arrows, the human telos is to pursue the good. Christianity fulfilled and transformed this idea by declaring that our telos is not just moral virtue but communion with God Himself.
Naturalism takes a knife to this heritage. It says the universe has no telos. It is a random accident. Your life has no higher purpose than that of a rock rolling down a hill.
But human beings are creatures who crave meaning. Deny telos and you don’t get neutrality; you get despair.
Conclusion: Why Naturalism is a dismal failure
The irony is that in trying to reduce everything to matter, naturalism ends up explaining nothing that matters.
I think back to Ms. Moon’s classroom.
If I could step back into that classroom, re-inhabiting my sixteen-year-old body with the mind I have now, I would not smirk silently. I would raise my hand and say:
“Yes, Ms. Moon, we are animals. Look at us — gossiping, flirting, fighting like chimps in sneakers. In that sense, you are right. But you have told us only half the story. Because we are also something more. We are animals who write poetry, animals who die for love, animals who ask why there is something rather than nothing. No mere beast stands at a grave and wonders about eternity. No wolf contemplates justice. No chimpanzee writes Hamlet.
You tell us we are animals. I tell you we are dust haunted by God. Clay that sings. Flesh that dreams of the infinite. To reduce us to animals is not just incomplete. It is a lie. And lies, however comfortable, always devour the souls of those who believe them.”
Endnotes
Robert C. Koons, “The Waning of Materialism,” University of Texas.
Michael Rea, World Without Design: The Ontological Consequences of Naturalism (Oxford University Press, 2002).
David Armstrong, A World of States of Affairs (Cambridge University Press, 1997).
Karl Popper, Conjectures and Refutations (Routledge, 1963).
Richard Taylor, Metaphysics (Prentice Hall, 1992).
John Searle, The Rediscovery of the Mind (MIT Press, 1992).
William Hasker, The Emergent Self (Cornell University Press, 1999).
Thomas Nagel, Mind and Cosmos (Oxford University Press, 2012).
Roger Penrose, The Emperor’s New Mind (Oxford University Press, 1989).
Charles Taylor, A Secular Age (Harvard University Press, 2007).
Peter Harrison, The Territories of Science and Religion (University of Chicago Press, 2015).