You can draw a cartoon of Jesus injecting himself with heroin, eating babies, and having rough sex with Judas and no Christian will behead you.

But you cannot show an innocent and totally harmless drawing of Mohammed to your class w/o being beheaded by a fanatic.

Sure, not all Muslims feel the same way, this is obvious. And sure, most educated Muslims raised in the West probably agree that inflicting physical harm to others over an innocent drawing is stupid….but how many of them do you think would feel comfortable drawing Mohammed?