Philosophical arguments for God's existence

Theme C1 covers the classic philosophical arguments for the existence of God — the Design argument, the First Cause argument, and the argument from miracles — alongside key challenges.

The Design argument (Teleological)

The word teleological comes from the Greek telos (purpose/end). The argument holds that the universe shows evidence of purposeful design, which implies a Designer.

William Paley (1802) — the watchmaker analogy:

• If you found a watch on a heath, its complexity and purpose would lead you to conclude it had a maker.
• The universe is vastly more complex and purposeful than a watch.
• Therefore, the universe must also have a maker — God.

Thomas Aquinas's Fifth Way:

• Natural things (e.g. an acorn growing into an oak) act towards ends without intelligence.
• Things that lack intelligence cannot move towards ends unless directed by a being with intelligence.
• Therefore, an intelligent being (God) directs all natural things to their purposes.

The anthropic principle / fine-tuning argument:

• The fundamental constants of the universe (gravitational constant, speed of light, mass of the electron) are exquisitely fine-tuned to permit life.
• Even a tiny variation would make life impossible.
• The probability of this occurring by chance is astronomically small.
• Inference: a Designer set these constants (John Polkinghorne, Richard Swinburne).

Challenges:

• David Hume (Dialogues Concerning Natural Religion, 1779): The analogy is weak — the universe is not like a machine. We can only infer a designer if we have experience of things being designed; we have no experience of universes being made. The designer could be multiple, imperfect, or not the God of classical theism.
• Charles Darwin: Natural selection explains apparent design in living things without a designer.
• The problem of poor design: If God is the designer, why are there vestigial organs, parasites, and vast amounts of suffering built into nature?

The First Cause argument (Cosmological)

Originating with Aristotle and developed by Aquinas (Five Ways, 1a and 3a):

1. Everything that exists has a cause.
2. The chain of causes cannot go back infinitely.
3. Therefore, there must be a First (uncaused) Cause.
4. This First Cause is God.

Leibniz's version — the principle of sufficient reason:

• Everything has an explanation for why it exists.
• The universe exists, so it must have a sufficient explanation.
• The only sufficient explanation is a necessary being that exists by its own nature — God.

Challenges:

• Bertrand Russell: "The universe is simply there, and that's all." We cannot assume the universe itself needs a cause.
• Hume: Why can't the universe itself be the "uncaused" entity? Why is a stopping point required?
• Infinite regress: Even if we accept the argument, it does not prove the First Cause is the God of Christianity or Islam.
• Quantum mechanics: At the subatomic level, some events appear to be uncaused (quantum vacuum fluctuations). Perhaps the universe "began" from a quantum state with no external cause.

The argument from miracles

A miracle is an extraordinary event that cannot be explained by natural laws and is attributed to divine agency.

Definition: David Hume defines a miracle as "a transgression of a law of nature by a particular volition of the Deity." This definition is itself a challenge — Hume argues we should almost never believe a miracle report, because the evidence for the regularity of natural law is stronger than any testimony.

The argument:

1. Miracles occur (e.g. the resurrection of Jesus, healing at Lourdes, the parting of the Red Sea).
2. Miracles cannot be explained by natural causes.
3. The best explanation is that God caused them.
4. Therefore, God exists.

Richard Swinburne supports this: the cumulative evidence of religious experience and miracle reports is best explained by theism.

Challenges:

• Hume's maxim: "No testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous than the fact, which it endeavours to establish." In other words, the evidence for natural law always outweighs miracle reports.
• Alternative explanations: Apparent miracles may be medical recoveries not yet understood, psychological phenomena, or misremembering.
• Other religions claim miracles too — they cannot all be right; so miracle reports cannot straightforwardly prove the God of one particular tradition.

Examiner tips

• Always name at least two philosophers per argument.
• For challenges, Hume is almost always relevant — cite his specific works.
• Show you understand the structure of the argument (premise → conclusion) not just the example.
• For 12-mark questions: give reasons to agree (the argument works), then reasons to disagree (challenges), then a reasoned conclusion.