50 reasons

God is Imaginary - 50 simple proofs:
1. Try Praying
2. Statistically analyze prayer
3. Look at all historical gods
4. Think about science
5. Read the Bible
6. Ponder God's plan
7. Understand religious delusion
8. Think about Near Death Experiences
9. Understand ambiguity
10. Watch the offering plate"

the list, as suggested by the title, goes all the way to 50, and each numbered 'proofs' leads you to a full page of reasonings, explanations and examples
via GrowABrain