How many Gods are there?
For as many religions there are and their respective gods, you'll have the number of Gods.
Who's the REAL one?
How can you prove any religion in the first place? How do you disprove the validity of one religious belief over the other? You can't. It's faith.
Plus, there's already a thread that discusses religions. Use it:
What are your Religious Beliefs?
My thoughts on Anime @ www.animananime.com