Where Do Morals Come From? — The Argument Atheists Can't Easily Dismiss
Virtually every human society shares a sense of right and wrong. Where does it come from? The moral argument for God's existence remains one of the most difficult challenges for secular philosophy.
The Argument Atheists Can’t Easily Dismiss
Here’s a thought experiment. Imagine you’re watching a stranger kick a dog for fun. Not because the dog threatened them. Not by accident. Just… because.
You feel something. Revulsion. Anger. A deep sense of wrongness.
Now here’s the question that has haunted philosophers for millennia: where does that sense of wrongness come from? And more importantly — is it real? Is kicking that dog actually, objectively wrong? Or is it just a feeling your brain produces, no more meaningful than your preference for chocolate over vanilla?
This is the moral argument for God’s existence. And it’s far more powerful than most people realize.
The Observation: Moral Agreement Across Cultures
Before we get to arguments, let’s start with data.
Anthropologists have documented a remarkable phenomenon: every known human society in recorded history has operated with some sense of moral “ought.” Not identical moral codes — the specific rules vary wildly — but the concept that some things are genuinely right and others genuinely wrong appears to be universal.
C.S. Lewis noticed this and built it into the opening chapters of Mere Christianity (1952). He wasn’t arguing that all cultures agree on every moral question. They obviously don’t. He was pointing to something deeper: the fact that moral reasoning exists at all.
“Think of a country where people were admired for running away in battle, or where a man felt proud of double-crossing all the people who had been kindest to him. You might just as well try to imagine a country where two and two made five.” — C.S. Lewis, Mere Christianity
Lewis called this the Moral Law — not a list of specific rules, but the underlying sense that there is such a thing as right and wrong, that we ought to behave in certain ways regardless of whether we want to.
The anthropological data backs him up. Donald Brown’s catalog in Human Universals (1991) includes concepts like fairness, justice, empathy, prohibition against murder within the in-group, and obligations to reciprocate kindness. These aren’t Western inventions. They show up in isolated tribes in Papua New Guinea, in ancient Chinese philosophy, in Aboriginal Australian law, in pre-Columbian civilizations.
The question isn’t whether humans have moral intuitions. The question is: what explains them?
The Argument: Moral Law Points to a Moral Lawgiver
The moral argument can be stated simply:
- If objective moral values and duties exist, then God exists.
- Objective moral values and duties exist.
- Therefore, God exists.
The heavy lifting is in premises 1 and 2. Let’s take them in order.
Premise 1: Why Objective Morality Needs a Foundation
This is where most of the philosophical action happens. The claim isn’t that atheists can’t behave morally — of course they can. The claim is that without God, it’s extremely difficult to ground morality in anything objective.
What do we mean by “objective”? We mean moral truths that hold regardless of human opinion. The Holocaust was wrong even though the Nazis believed it was right. Slavery was wrong even when entire civilizations accepted it. If you agree with those statements, you believe in objective morality.
But here’s the problem: in a purely materialist universe — one consisting of nothing but matter and energy governed by physical laws — where do objective moral facts come from? Atoms aren’t moral. Chemical reactions aren’t moral. Natural selection doesn’t care about justice.
The philosopher J.L. Mackie, himself an atheist, was honest about this in The Miracle of Theism (1982):
“Moral properties constitute so odd a cluster of qualities and relations that they are most unlikely to have arisen in the ordinary course of events, without an all-powerful god to create them.”
Mackie’s solution was to deny that objective morality exists — a position called moral error theory. He argued that all our moral beliefs are systematically false. Bold, but at least consistent.
Friedrich Nietzsche saw this even more clearly. In The Gay Science (1882), he wrote the famous “God is dead” passage — and most people miss the point entirely. Nietzsche wasn’t celebrating. He was terrified. He understood that if God is dead, then the entire moral framework of Western civilization has lost its foundation:
“When one gives up the Christian faith, one pulls the right to Christian morality out from under one’s feet.” — Friedrich Nietzsche, Twilight of the Idols
Nietzsche understood what many modern atheists don’t: you can’t just remove God and keep the morality that was built on theistic foundations. If there is no Lawgiver, there is no Law. There are only preferences, power dynamics, and survival instincts dressed up in moral language.
Premise 2: Objective Moral Values Really Do Exist
Most people — including most atheists — live as though objective morality is real. They don’t just prefer that children not be tortured; they believe it’s actually wrong. They don’t just dislike genocide; they believe it’s objectively evil.
Philosopher Michael Ruse (an agnostic) has acknowledged this tension. As he put it in a debate with William Lane Craig:
“The man who says that it is morally acceptable to rape little children is just as mistaken as the man who says 2 + 2 = 5.”
If you agree with Ruse — and virtually everyone does — then you believe in objective moral facts. And you need an explanation for them.
The Euthyphro Dilemma: A Fair Challenge
No honest treatment of the moral argument can skip the Euthyphro dilemma, first posed by Plato around 380 BC. It goes like this:
Is something good because God commands it? Or does God command it because it’s good?
If the first option: morality seems arbitrary. God could have commanded torture, and it would be “good.”
If the second option: goodness exists independently of God, and God is just reporting on it. You don’t need God for morality after all.
This is a genuinely sharp objection, and it deserves a genuine answer.
The standard theistic response — developed by thinkers from Thomas Aquinas to William Lane Craig — is that the dilemma presents a false dichotomy. There’s a third option: God’s nature IS the good. Moral values aren’t arbitrary commands imposed from outside God’s character, nor are they an independent standard above God. They flow from who God is.
On this view, God doesn’t arbitrarily decide that love is good. God is love. Goodness, justice, compassion — these are reflections of the divine nature itself. God’s commands flow from God’s character, and God’s character is the ultimate standard of goodness.
Is this a satisfying answer? Philosophers debate it. But it’s important to note that it’s been the mainstream theistic response for over 800 years, and it does logically escape the two horns of the dilemma. The Euthyphro is a challenge, not a knockout.
Without God: The Alternatives
If objective morality doesn’t come from God, where does it come from? Let’s examine the main secular proposals.
Attempt 1: Sam Harris and “The Moral Landscape”
In The Moral Landscape (2010), neuroscientist Sam Harris argued that science can determine moral values. His framework: morality is about “the well-being of conscious creatures,” and science can study well-being.
It sounds compelling until you notice the circularity.
Why should we care about well-being? Harris says it’s obvious. But “obvious” isn’t an argument. The philosopher David Hume identified this problem in A Treatise of Human Nature (1739): you cannot derive an “ought” from an “is.” The fact that something increases well-being doesn’t logically entail that we ought to increase well-being. That’s known as Hume’s guillotine, and Harris never successfully crosses it.
Philosopher Patricia Churchland made a similar observation in her review of the book: Harris effectively defines morality as that which maximizes well-being and then declares science can study it — but the hard question of why we should maximize well-being is assumed, not answered.
Even Harris’s fellow atheist philosophers have pushed back. Philosopher Massimo Pigliucci, reviewing the book on his blog Rationally Speaking (2010), called it “an exercise in intellectual hubris,” and philosopher Ryan Born described the central thesis as containing an “unacknowledged gap.”
Attempt 2: Social Contract Theory
Maybe morality is just a set of rules societies agree to follow for mutual benefit. This is the social contract tradition, from Hobbes to Rawls.
The problem: social contracts explain why societies adopt certain rules, but they can’t explain why those rules are binding. If morality is just a contract, then it’s only as strong as the enforcement mechanism. And a contract can be renegotiated. A sufficiently powerful group could “renegotiate” the contract to exclude minorities, the disabled, or the unborn — and there would be no objective basis for saying they’re wrong.
History is full of exactly this kind of “renegotiation.” Slavery was legal. The Holocaust was legal. Apartheid was legal. If morality is just social agreement, then “legal” and “moral” collapse into the same thing — and that’s a conclusion almost no one is willing to accept.
Attempt 3: Evolution
This is the most popular secular explanation, and it deserves the most careful treatment.
Evolutionary psychology can explain why humans have moral instincts. Natural selection favored cooperation, reciprocity, and in-group loyalty because these traits improved survival and reproduction. We feel empathy because empathetic ancestors left more descendants. We feel guilt because guilt-prone individuals maintained social bonds. All of this is likely true.
But here’s the critical distinction: evolution can explain moral instincts but not moral obligations.
Your genes may predispose you to feel that stealing is wrong. But the feeling that something is wrong is not the same as it being wrong. Evolution also gave us instincts for aggression, tribalism, and sexual jealousy. Are those moral simply because they’re evolved?
The philosopher Sharon Street calls this the “Darwinian dilemma” for moral realism (2006). If our moral beliefs are the product of natural selection, and natural selection doesn’t track moral truth (it tracks reproductive fitness), then we have no reason to think our moral beliefs are true. They’re just useful fictions.
As philosopher Michael Ruse put it bluntly in Taking Darwin Seriously (1986):
“Morality is a biological adaptation no less than our hands and feet and teeth. Morality is just an aid to survival and reproduction… and any deeper meaning is illusory.”
If Ruse is right, then when you say “the Holocaust was wrong,” you’re not stating a fact. You’re expressing a feeling that evolution installed in you because it helped your ancestors survive. The Nazis had different feelings. And neither set of feelings is more true than the other.
Most people find that conclusion monstrous. And they should. But if evolution is the only explanation for morality, it’s where the logic leads.
The “Your Genes Say X” Problem
Let’s make this concrete with what we might call the is-ought gap in evolutionary ethics.
“Your genes incline you toward X” does not mean “you should do X.”
Your genes incline you toward calorie-dense food. That doesn’t mean you should eat junk food.
Your genes incline you toward tribal favoritism. That doesn’t mean you should be racist.
Your genes incline some people toward aggression. That doesn’t mean they should be violent.
If we can say “evolution gave us this instinct, but we should override it,” then we’re appealing to a moral standard above evolution. Where does that standard come from?
This is the gap that evolutionary ethics cannot bridge. It can describe what is — what instincts we have, what behaviors natural selection favored — but it cannot prescribe what ought to be. And morality is fundamentally about ought.
What the Bible Says
The biblical perspective on moral knowledge is surprisingly nuanced. Scripture doesn’t claim that only believers can know right from wrong. Quite the opposite:
(for when Gentiles who don’t have the law do by nature the things of the law, these, not having the law, are a law to themselves, in that they show the work of the law written in their hearts, their conscience testifying with them, and their thoughts among themselves accusing or else excusing them)
Paul is describing exactly what we observe: people who have never read a Bible, who belong to entirely different cultures, who nonetheless demonstrate moral knowledge. The Christian explanation is that this moral awareness is built into human nature because humans are made in God’s image:
God created man in his own image. In God’s image he created him; male and female he created them.
The image of God — the imago Dei — is the theological foundation for human moral awareness. It’s not that God handed us a rulebook; it’s that moral knowledge is woven into our nature because our nature reflects its Creator.
And the content of that moral knowledge? The prophet Micah summarized it with breathtaking simplicity:
He has shown you, O man, what is good. What does Yahweh require of you, but to act justly, to love mercy, and to walk humbly with your God?
Justice. Mercy. Humility. These aren’t arbitrary divine commands. They reflect who God is. And they resonate with human beings across every culture because humans are made to reflect that same character.
Addressing Objections
“But different cultures have different morals!” Yes — and different cultures have different scientific beliefs too. The existence of disagreement doesn’t mean there’s no truth. What’s striking is not the differences but the deep agreement: that murder, theft, betrayal, and cruelty are wrong; that courage, honesty, generosity, and fairness are good. The details vary; the framework is universal.
“You don’t need God to be moral!” Absolutely true. The moral argument never claims otherwise. Atheists can be (and often are) deeply moral people. The question isn’t about moral behavior — it’s about moral ontology. Can you be a good person without believing in God? Obviously. Can you ground the objective reality of good and evil without God? That’s the harder question.
“This is just a God-of-the-gaps argument!” God-of-the-gaps plugs God into ignorance — “we don’t know, therefore God.” The moral argument does the opposite. It starts with something we do know — that objective moral values exist — and asks what best explains them. It’s an inference to the best explanation, the same logical method used in science.
The Weight of the Argument
The moral argument doesn’t prove God’s existence with mathematical certainty. No philosophical argument does that. What it does is show that the universal human experience of moral obligation — the deep, unshakable sense that some things really are right and others really are wrong — fits naturally within a theistic worldview and sits very uncomfortably within a purely materialist one.
Nietzsche saw this. Mackie saw this. Even Ruse and Street see this. The question is whether we’re willing to follow the logic where it leads.
If objective moral values exist — and we all live as though they do — then the universe is not the blind, purposeless place that materialism describes. There is a moral law. And a moral law, as Lewis argued, is powerful evidence for a moral Lawgiver.
The dog-kicking was wrong. Really wrong. Not “wrong for you” or “wrong in your culture” or “wrong because evolution.” Just wrong.
If you believe that, you might be more of a theist than you think.
Further reading: C.S. Lewis, Mere Christianity (1952); William Lane Craig, “The Moral Argument” in Reasonable Faith (2008); J.L. Mackie, Ethics: Inventing Right and Wrong (1977); Sharon Street, “A Darwinian Dilemma for Realist Theories of Value” (2006)