Tom Coates has a good entry on his site about being an atheist. He quotes some of the 300 proofs for the existence of God. Best being this catchall:
ARGUMENT FROM THE BIBLE
(1) [arbitrary passage from OT]
(2) [arbitrary passage from NT]
(3) Therefore, God exists
ARGUMENT FROM THE BIBLE
(1) [arbitrary passage from OT]
(2) [arbitrary passage from NT]
(3) Therefore, God exists
But yeah, quoting from the bible to prove that God exists - I can't believe how many people don't see the flaw in that logic.