Ontological Argument

P1: God, by definition, has all perfections of a being.

P2: Existence is a perfection for a being.

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C: So God exists.

Refutation by Logical Analogy

P1: The perfect island, by definition, has all perfections of an island.

P2: Existence is a perfection for an island.

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C: So the perfect island exists.

Cosmological Argument

P1: Every being is either dependent or self-existent.

P2: Not every being is dependent.

C: So some being is self-existent, and that is God.

Teleological Argument

P1: A found watch has many part that work together to produce certain effects.

P2: The best available explanation of this is that the watch had a designer.

C1: So the watch had a designer.

P3: The universe is like a found watch.

C2: So the universe had a designer, and that is God.