Yeah, some people simply can't wrap their wits around the fact that not everyone believes that the stuff a few men in the Middle East wrote down five thousand years ago is holy just because they said so.

Doesn't mean it can't be perfectly fine for individuals to base their own lives on. People all over the world base their lives on a variety of so-called holy books, and many seem happier for it. But forcing it on others and making them pledge to it would be sort of the opposite of what the First Amendment says.