You find fault in the statement? If so, you might take a peek back into what we know as American history. Indeed, it would be in err to suggest that all of the Founders were Atheists. However, there can be little doubt from what we might discern today, that few of them were Christians.
Heck, the religious oppression experienced abroad is what brought many here to begin with!

That said, I feel that making the assumption that anyone choosing to believe in God is an idiot is foolish as well. Idiots abound on all sides of any argument or belief. His manner of expressing the reality of the matter leaves no middle ground. Not a good idea for something so irrefutably beyond one's ability to demonstrate or refute.