For one, how about you stop grouping together every Christian as the same person. Not every single Christian feels the same way as everyone else. I hate that there are "spokespeople" for Christianity, because most of the time I think they're full of shit.
Secondly, those of you in this thread who are mad at family guy for prodding out atheists and making them out to be evil...you do realize that this was a joke, right? And that's not even the best part...it was a joke aimed at the people who actually do that in real life. I'm a Christian, but I don't condemn an atheist for not believing in a god. Hell, I don't condemn other religions either. I liked the message that episode had - "It's not evil being atheist."
Last, I hate preachy people as much as the next guy. I hate it when an atheist tells me that I'm an idiot for believing that God exists. I hate it when I'm told that there is no scientific proof of a deity. However, I also hate it when there are those preachy Christians who think they know everything and that it's their job to save the world.