For the love of pete, it's a TV show. Family Guy's digs on Catholicism offend me far more than South Park's do (mainly because FG is ignorant, whereas SP knows what it's talking about.) But you don't see me calling for them to take off any episodes of it.
If you truly think South Park hates God, the Catholic Church, etc, then go watch the episode dealing with the pedophilia scandal.
I won't watch any of it. I'll now spit when it comes on.