I read up on these pastachamacalits a while back. They're just protesting the teaching of Creationism in school. They believe that if Creationism courses are to be offered to students, then so must classes about their spaghetti faith. They don't hate Christianity, they just want the system to be fair, so relax. They aren't insulting your religion.
As far as I know, anyway. But wikipedia could be wrong, and they could be a bunch of extremely arrogant atheists who REALLY ARE insulting your religion and think it's OK to refer to religious people as "idiots" or "inferior beings". But I like to hope that they're nicer than that.
Or maybe, just maybe, they all REALLY DO believe in a spaghetti monster god. And that's alright of course. There's nothing wrong with that in my book. After all, our BRAINS look like spaghetti.
Well those are my three theories. If an actual Pastafarian would like to tell me which of the above is true, I'd really appreciate that.