I personally don't believe in god. However saying "there was no big bang, so god must exist" is a logical fallacy. Thousands of "gods" have "existed" and thousands have gone out of existence. Several thousands of years from now, something else will be worshiped and people will look at the Judeo-Christian god just as we do the Egyptian, Greek, Roman, and Norse gods.
I just hope that what they choose to worship in the future is a cute blonde or something so it will be slightly more tolerable when brought up in conversation.