Does God Exist, and How Can We Know?
This section sets out the classical and contemporary arguments on both sides, fairly and in their strongest forms, so that a reader can weigh them directly.
Two kinds of evidence stand behind the arguments. The first is faith. Faith is a universal human phenomenon, present in every person in some degree. It provides a personal certainty that cannot be measured or handed to another person, and it is the ground on which believers stand when they say they know God.
The second is reason. Reason is available to all, and it produces arguments that can be examined by anyone. A transcendent God exceeds full human definition, so the arguments of reason establish high probability rather than mathematical certainty. Together, faith and reason provide cognitive certainty for the believer: faith supplies the certainty, and reason supplies the public case that the certainty is well placed.
The arguments are arranged in two branches. The arguments for God are grouped by kind: arguments from reason alone, arguments from the existence and order of the world, arguments from value, mind, and experience, and the cumulative case. The arguments against God are grouped as evidential arguments, answers to the arguments for God, and coherence arguments, which ask whether the idea of God is consistent at all. Every argument page carries its standard objections, and every objection page carries the standard theistic responses, so no argument stands without its reply.
Arguments For God
- Ontological Argument — God is the greatest conceivable being, and a being that exists is greater than one that does not, so God must exist.
- Cosmological Argument — Everything that begins to exist has a cause, and the universe began to exist, so the universe has a cause.
- Teleological / Design Argument — The order, complexity, and fine-tuning of the universe point to a designer rather than to chance alone.
- Moral Argument — Objective moral values and duties exist, and they are best explained by a moral lawgiver.
- Argument from Consciousness — Conscious, intentional minds are difficult to explain on a purely physical account of the world, and theism explains them better.
- Argument from Reason — The reliability of human reason, and the laws of logic themselves, point to a rational ground beyond the natural world.
- Argument from Religious Experience — Widespread and persistent religious experiences are best explained by a transcendent reality that people genuinely encounter.
- Argument from Miracles — Reports of miracles, above all the resurrection of Jesus, provide evidence that a supernatural power acts in the world.
- Aesthetic Argument — The experience of beauty and sublimity points beyond the natural world to a source of beauty itself.
- Cumulative Case / Pascal's Wager — No single argument may settle the question alone, but together the arguments form a cumulative case, and Pascal's Wager adds a prudential reason to believe.
- Transcendental Argument — Logic, science, and objective morality presuppose the Christian God, without whom they have no final ground.
Arguments Against God
- Problem of Evil — The suffering of the world is said to count against a God who is all-powerful, all-knowing, and perfectly good.
- Divine Hiddenness — If God were perfectly loving, reasonable people would not remain without belief; yet many do.
- Omnipotence Paradox / Coherence of Theism — The stone paradox asks whether a God who can do anything can make a stone too heavy for God to lift.
- Foreknowledge and Free Will — If God already knows infallibly what each person will do, the future seems fixed and human freedom seems lost.
- Omnipotence and Omniscience Incoherence — The divine attributes themselves are said to conflict, so that no being could hold them all together.
- Argument from Non-Belief — The sheer scale of unbelief in the world is said to fit naturalism better than theism.
- Cosmological Disproof — Modern cosmology is said to remove the need for a first cause of the universe.
- Teleological Disproof — Evolution and natural explanations of fine-tuning are said to remove the need for a designer.
- Ontological Disproof — The ontological argument is said to fail because existence is not a property that can be built into a definition.