Does God exist?

What Scripture says

The Bible never tries to prove God from scratch. It opens by assuming him: “In the beginning, God created the heavens and the earth” (Genesis 1:1, ESV). But it does claim that the evidence for God is out in the open, available to everyone:

• “The heavens declare the glory of God, and the sky above proclaims his handiwork” (Psalm 19:1).
• God’s “eternal power and divine nature” have been “clearly perceived” in “the things that have been made” (Romans 1:20).
• God “did not leave himself without witness”, giving rain and fruitful seasons (Acts 14:17).
• In Athens, Paul reasons with philosophers that the God who made the world “is actually not far from each one of us” (Acts 17:24–28).

Scripture also says moral awareness points to God: the law is “written on their hearts” (Romans 2:15). And it expects people to seek him: whoever draws near to God “must believe that he exists and that he rewards those who seek him” (Hebrews 11:6).

So Scripture expects people to reason from the world to its Maker. It also expects that reasoning to point to someone personal, not just to a first cause.

What the evidence says

Philosophy

Philosophers have debated God’s existence for at least 2,500 years. No single argument settles it, but several have stood the test of time. Each is stated here in its strongest form, with its best objection.

The cosmological argument: why is there something rather than nothing?

There are two main versions.

The kalam argument (from medieval Islamic and Christian thinkers, revived by William Lane Craig):

1. Whatever begins to exist has a cause.
2. The universe began to exist.
3. So the universe has a cause.

The cause must be outside space and time (since it created them), enormously powerful, and arguably personal, since it chose to create a universe with a beginning rather than one that existed eternally. Premise 2 is supported by modern cosmology and by philosophical arguments against an infinite past (see 1.2).

The argument from contingency (associated with Leibniz and Aquinas):

1. Everything that exists has an explanation, either in its own nature or in something else.
2. The universe doesn’t explain itself: it could have been different, or not existed at all.
3. So its explanation lies in something that exists by its own nature, a necessary being.

Best objection: the universe, or some deeper physical reality, might itself be necessary or a “brute fact” with no explanation. Graham Oppy argues an uncaused natural starting point is as simple as an uncaused God. Defenders reply that the universe shows every sign of being contingent: it has a beginning and finely set constants that could have been otherwise.

The moral argument: where do real moral duties come from?

1. If God doesn’t exist, objective moral duties don’t exist.
2. Objective moral duties do exist.
3. So God exists.

Most people are as sure that torturing children for fun is wrong as they are of anything. If that wrongness is real, and not just a feeling or a cultural habit, it needs a foundation. A good, personal God provides one: moral duties are commands from someone with authority, grounded in his good character (see 1.5 and 9.5).

Best objection: some atheist philosophers, such as Erik Wielenberg, argue that moral facts are simply true, like the laws of logic, and need no foundation. Others argue evolution explains our moral sense. Theists reply that an evolutionary explanation of our moral feelings gives no reason to think they track real moral truths.

The fine-tuning argument: why is the universe set up for life?

The laws of physics contain constants, such as the strength of gravity and the mass of the electron, that fall within very narrow ranges that permit life (see 1.3). The argument runs:

1. The fine-tuning is due either to physical necessity, chance, or design.
2. It isn’t plausibly due to necessity or chance.
3. So it is due to design.

Best objection: a multiverse. If there are countless universes with different constants, we would naturally find ourselves in one where life is possible. Critics reply that there is no direct evidence for other universes, and the mechanism generating them would itself need fine-tuning.

Other arguments

• Consciousness and reason. It is hard to explain how purely physical processes produce conscious experience and reliable reasoning. Alvin Plantinga argues that if our minds were shaped only for survival, we would have little reason to trust them about abstract truths.
• Religious experience. Millions of people report experiencing God. That doesn’t prove God exists, but it is evidence, in the same way our everyday experience is evidence for the world around us, unless there is reason to doubt it.
• History. If Jesus rose from the dead, that is strong evidence for God (see 7.9).
• The ontological argument. Anselm argued that God, as the greatest conceivable being, must exist. It is famous and still debated, but many philosophers, including many theists, find it less persuasive than the others.

The case against

Fairness means stating the strongest reasons people give for atheism:

• The problem of evil. Why would a good, all-powerful God allow so much suffering? (See 9.1 and 9.2.)
• Divine hiddenness. If God wanted relationship with us, why isn’t he more obvious? (See 1.8.)
• Simplicity. Some argue a purely natural universe is a simpler explanation than one with God added.
• Religious disagreement. If God exists, why do people disagree so much about him?

Science

Science can’t test God directly, the way it tests a chemical reaction. God, as Christians understand him, isn’t one more object inside the universe. But science shapes the premises of the arguments:

• The universe had a beginning. Big Bang cosmology, the second law of thermodynamics and the Borde–Guth–Vilenkin theorem all point to a finite past (see 1.2).
• The universe is fine-tuned. This is widely accepted by physicists, including non-believers (see 1.3).
• The universe is intelligible. Nature follows elegant mathematical laws we can discover. Physicist Eugene Wigner called this “the unreasonable effectiveness of mathematics”. Belief in a rational Creator expects it; a purely accidental universe doesn’t obviously predict it.

Neither finding forces the conclusion, because other explanations exist. But each fits naturally with a Creator.

The arguments at a glance

Argument	What it points to	Strongest objection
Cosmological	A cause beyond space and time	The universe may be a brute fact
Moral	A source of real moral duties	Moral facts may need no source
Fine-tuning	A designer of the laws	A multiverse
Consciousness	A mind behind minds	Future neuroscience may explain it
Resurrection	God acting in history	Miracles can’t be accepted

What philosophers think

Philosophers disagree. In the 2009 PhilPapers survey of professional philosophers, about 73% accepted or leaned toward atheism and about 15% toward theism. Among specialists in philosophy of religion, the figures were roughly reversed: about 72% leaned toward theism. Both sides draw conclusions from this. Skeptics say believers are drawn to the field. Theists say those who study the arguments most closely find them strongest. What the survey shows clearly is that belief in God is held by many of the people who know the arguments best.

Where they meet

The arguments don’t work like a mathematical proof. They work like a court case: several independent lines of evidence pointing the same way. A beginning of the universe, its fine-tuning, the reality of moral duties, the existence of conscious minds and the historical case for the resurrection (7.9) together make belief in God reasonable, and arguably the best explanation of the whole picture.

This fits what Scripture says: the evidence is real and public, but it invites a response rather than forcing one (see 1.8).

What’s still open

• Each premise has thoughtful critics, and the debate continues in academic philosophy.
• A first cause isn’t automatically the God of the Bible. The arguments point to a powerful, personal Creator; Scripture and history fill in who he is.
• The problem of evil remains the most serious argument on the other side (9.1, 9.2).

Bottom line

The cosmological, fine-tuning and moral arguments build a strong cumulative case. It can’t be proven like a math theorem, but belief in God is reasonable, and many of the philosophers who study the question most closely hold it. It is rated Debated because capable philosophers on both sides still disagree about the premises.