They're pissed that their Scientology episode won't get re-aired.
It's also pretty hypocritical that they can show Jesus crapping all over George Bush and the American Flag, but can't show Mohammad giving Peter Griffin a hearring on top of a football helmit.
I wouldn't be surprised if this is one of the last seasons of Southpark. It's been on for about 8 years, and until this season, I don't think Comedy Central has pulled any episodes or censored it.
Admittadly, I can understand why the image of Mohammad was censored. However, as the show said, who's to stop the next group from getting a future episode pulled or censored if they find it offensive?
As it stands:
Muslims and Scientologists: Not ok to make fun of.
Christians, Jews, poor people, white people, black people, hispanic people, asian people, republicans, democrats, gay people, retarded people, and handicapped people: Ok to make fun of.
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"The Rich are there to take all of the money & pay none of the taxes, the middle class is there to do all the work and pay all the taxes, and the poor are there to scare the crap out of the middle class." -George Carlin