I obviously arrived too late to properly add to this thread, so let me just say this in response to the OP:
Yes, I dislike extremists of any kind, too, and I don't like it when threads get out of hand and devolve into mindless flaming.
But no, I don't think we should avoid religious (and even anti-religious) threads as long as they're civil and not a flame war.
Just because you don't like it doesn't mean it should be stopped.
I don't like all those threads about guns, but I'm not petitioning against them.
However, when such a thread ends up with flames and aggressions flying around, either a mod has to step in and clean it up or close the thread. We have moderators for a reason, let them moderate.
It's always the argument when a religion thread opens up that "this'll end in flames" but, funnily enough, often it does not happen. And sometimes, when it happens, it's because of the people saying it'll end in flames. They're fulfilling their own prophecy.
So let's just keep it civil, continue our discussions and let the moderators handle it.