The Simplest Answer Usually Wins

A medieval philosopher named William of Ockham is remembered for a principle that became central to science: don’t multiply assumptions beyond what’s needed. The exact slogan came later, but the idea is his, and it’s simple. When two explanations account for the evidence equally well, prefer the one that assumes less.

That’s Occam’s Razor. It doesn’t say the simpler answer is always right. It says extra assumptions are extra chances to be wrong, so they need to earn their keep. Now let’s apply it to the biggest question there is.

Counting the Assumptions

What theism asks you to accept: a being of infinite power, knowledge, and goodness; a supernatural realm outside space and time; immaterial souls that exist independently of brains; mechanisms by which the divine acts on the physical world; an afterlife realm; transcendent moral laws; and a cosmic purpose behind events. None of these has ever been directly observed. Each one is an added assumption.

What naturalism asks you to accept: matter, energy, and the natural laws describing how they interact. All three are measured every day, in every lab on Earth. Everything else, stars, storms, cells, brains, is explained as combinations of them.

If both worldviews explained our observations equally well, the razor would already favor naturalism. But the comparison is actually lopsided in a second way, because they don’t explain equally well.

Four Head-to-Head Tests

Lightning. Ancient Greeks said Zeus hurled thunderbolts when angered: an explanation requiring a god, a divine realm, divine emotions, and a way for all that to reach the sky. Modern physics explains lightning as electrical discharge from charge separation in storm clouds. The natural account requires less, and it delivers more: forecasters warn you before the storm, and lightning rods on your roof actually work.

Disease. Medieval Europeans attributed illness to divine punishment or demonic possession, treated with prayer and exorcism. Germ theory explains disease through microorganisms you can watch under a microscope. Antibiotics, vaccines, and surgery followed, and human life expectancy climbed by decades. Supernatural medicine, across all its centuries, never produced one verified cure.

Earthquakes. Greeks said Poseidon struck the earth; some Hindu traditions pictured a great serpent stirring beneath it. Geology explains earthquakes through plate tectonics, which is why they cluster along plate boundaries, why California shakes and Florida doesn’t, and why engineers can design buildings that survive them. Nobody can predict an individual quake, but geologists forecast regional probabilities well enough to save lives. Trident theory predicts nothing.

Mental illness. Medieval Christianity often read mental illness as possession, treated by exorcism, which meant suffering people were feared instead of helped. Modern science understands mental illness through brain biology, genetics, and life circumstances, imperfectly, with plenty still unknown, but well enough that therapy and medication demonstrably help millions. The honest comparison isn’t “science has it all figured out.” It’s that the natural approach keeps improving and the possession approach never could.

A Pattern With One Direction

In every one of these cases, and in every other case on record, the movement went one way: from supernatural explanation to natural explanation. Weather, disease, heredity, the motion of planets, the shaking of the ground. Not once has science had to reverse course and say “actually, this one needs a god after all.” Natural explanations have never been displaced by supernatural ones. That one-way pattern is itself evidence about which kind of explanation tracks reality.

“But Isn’t God the Simplest Explanation?”

This is the strongest theistic reply, and it deserves a fair statement. The philosopher Richard Swinburne argues that God is actually the simplest hypothesis: one entity, with properties that are infinite rather than arbitrarily limited, explaining everything at once. “God made everything” sounds simpler than a universe of particular laws and constants.

Here’s the difficulty. Simplicity in explanation isn’t about how short the sentence is. It’s about how much unexplained machinery the hypothesis brings with it. A mind capable of designing and creating universes, existing with no cause and no parts and no history, is not a simple thing. It’s the most extraordinary thing ever proposed, offered to explain something less extraordinary. And watch what happens to the question:

Q: Why does anything exist?
A: God created it.
Q: Then why does God exist?
A: God just is. God is necessary, eternal, self-existent.

Nothing got explained. The mystery was relocated and then declared exempt. And if “some things can just exist without explanation” is allowed for God, it’s equally available for the universe itself, at which point the extra being does no work at all. The razor cuts it away.

What Would We Expect to See?

If reality ran on supernatural machinery, we’d expect at least some phenomena to resist natural explanation forever, and some supernatural explanations to win a head-to-head test somewhere, sometime. Instead, after five centuries of looking, the score is what it is. That doesn’t prove no god exists. It means that when you weigh two pictures of reality, one needing only what we can already measure and one needing an entire invisible realm, honesty about the track record points to the leaner picture. Simplicity isn’t a bias. It’s what’s left when you stop adding things you can’t show.

Related Arguments

Want to Go Deeper?