Sorry to bump this failing thread, but I felt I had to comment.
As everyone else (pretty much) has been saying, we don't know. I personally think that the big bang is more likely than there being a god of some sort. Seriously, in response to the jesus freaks above, religion is the very last thing you can tell people is true. The big bang has real evidence.
Don't worry about it, we'll never know.
Also, about the big bang, it's not just a theory that something exploded out of nothing and all of this matter flowed out everywhere. There quite probably could have been stuff around when whatever happened occurred.
On a point of clarification, athiests don't necessarily believe in the big bang. Many of them seek better understanding of the REAL world around them and are open minded to what can be proven (or what is probable).