well yeah
but it's a pain in the ass to have some bible thumping retard say "you're an atheist? WELL YOU CANT KNOW FOR SURE THAT THERES NO GOD AND THAT TAKES MORE FAITH THAN BELIEVING IN ONE" or "how can you claim there's no god, there's no proof and that's not scientific at all!"
that's usually the point where I find something offensive to say
edit: oh wait, wasn't that second part pretty much what you said?