jgnat - Its a good point. I also think its disingenuous for christians to use first casue as an argument for god. They now they are claiming far more than that for their deity.
Lets say we conceded for the sake of argument that the supernatural was as good an explanation for the big bang as anything else. What has followed the big bang in the past 13.7 billion years is equally consistent with a god who killed himself in the explosion.