Update: The Catholic League has released a statement on its website (Thanks David Ferrine) :
On last night’s episode of the Comedy Central show South Park, Catholic League president Bill Donohue appeared as one of the cartoon characters, along with a figure of Pope Benedict XVI. The Easter script depicted Donohue chastising the pope for being too soft. Donohue then takes over as pope. When a Jesus figure appears, he has both the pope and Jesus arrested. After Jesus is killed by Kyle, he resurrects and kills Donohue.
Donohue commented on this today: “I have no idea why ‘South Park’ creators Matt Stone and Trey Parker caricature me as a heartless thug. In any event, I stand convicted and have no defense. Now I have to get back to business—I hear someone just took some liberties with the Easter Bunny.”