Ahh, so the universe can't "just happen", it had to be created. What if we apply the same logic to your God. Who created Him?
Oh, He's simply been here since the beginning of time?
So has the universe. Before the big bang, time (and other aspects of physics) as we perceive it (them) didn't exist.
Trying to reason with a religious nut is an exercise in futility. However, put two religions in the same room and they will cancel each other out. Just bring up the Egyptian and/or the Greek gods and sic those guys at Yahweh. And then just stand back while the 'nonexistent' fireworks fly.
Both sides have no physical proof of each others gods, and perfectly willing to go to great lengths rationalizing their own existence through metaphors. Makes me wonder why nobody's every tried it. It's always Science vs Christianity, but i'd like to see a debate between the different religions.