I have never seen the TV show South Park, but I have heard that it is clever in a goofy, sophomoric and irreverent sort of way.
You have probably heard that fanatics have threatened Comedy Central about South Park's irreverence towards Mohammed (pbuh). Comedy Central folded like a cheap camera. Hence South Park now has the Prophet appearing in a bear costume, and as Santa Claus. Kinda funny, if you can take a joke. Doubt they can.
As Kate observes:
The "extremist" is the one with the death threat.
The "moderate" is the one who explains what you've done to deserve it.
If you want to have religion in the world today, you have to be big enough to take some teasing and/or annoyance from those who don't get it. If you have a religion with vocal murderous and hateful people in it today, teasing is the least one should expect.
But Everybody Draw Mohammed Day is just teasing.