You guys really hate Christians, after all. (Am I actually allowed to be here or am I banned for my religion?)

Technically, it's "Christianity" that some of us don't like very much. Many of us live in countries where people who call themselves "Christians" compose much of the population, and going around hating everyone we see won't get us very far in life. We might wish that they weren't Christians, but while we're dreaming we might as well wish for a pony, too.

And, no, we don't ban people for saying that they're Christians. It takes a lot to get banned here.

I shouldn't be here; you don't want me here, not to mention I probably shouldn't bother talking to people who only want me to hate God.

Well, so far you haven't given us much of a reason to want you gone. Also, people who call themselves atheists usually don't really care whether or not you "hate God" any more than we care about whether you "hate Santa Claus".

Why am I even here again? Seriously, why am I not just lurking? That would make more sense.

Because you feel you have something you want to say?