LOL, Hero.
If they did jokes about Muhammad, the radical groups would literally have Seth Green's head.
I have nothing agaist muslims, in fact one of my friends is a muslim, but it is a fact that there are radicals that act violently when their religion is made fun of. Seth Green and his team of losers are too cowardly to make fun of the muslim religion. And I hope they never make fun of anyones religion ever again, but I know they will because the Robot Chicken team is nothing but a bunch of pigs.
By the way, Robot Chicken is only popular because of the characters they make fun of. They are getting viewers based on copy righted characters that are not their own. Robot Chicken, you suck. I hope Marvel Comics, DC Comics, Nintendo, and all the other groups sue the crap out of you.