It's not my intention to get into a religious debate, but I think there's a misconception that anyone that isn't Christian is doing it just because they want to be bad or something. Or that they "choose" not to believe.
Personally, I believe there's something out there. Something that created us, perhaps. But I've looked at all the major religions and instead of enlightenment, I find disappointment. No religion fits what I view is "right" and "just". If I take a religion and change it to fit my views, do I really even believe in that religion anymore?
That's why I don't follow any religion, per se. I try to be kind and respectful to others. If God exists and he condemns me to Hell because I was kind to people but had a hard time "accepting" Jesus as my "savior".. well.. what kind of God is that?
(I happen to think Jesus was a pretty awesome guy. Whether or not he existed or whether or not he's the Savior is up for debate. I just happen to think he was a nice guy. Always helping out the poor. Who'd he hang out with? The self-righteous? The hypocrites? No, he hung out with probably the kinds of people that most Christians would lock up in a minute. And instead of stoning them, he tried to teach them.)