Proof of God: The Bible
Proof of Middle Earth: The Lord of the Rings trilogy, The Hobbit, The Silmarillion...
By the standard of "Evidence" that Christians claim to prove the existence of God, there is More Evidence of Middle Earth, Hobbits, Wizards, Dragons, and Elves than there is of God and Heaven.
Get real, Christians. Harry Potter isn't real because he has 7 books about him. Neither is God.