The video was conceived and written by Marc Shaiman, the Tony-winning composer of "Hairspray" and "South Park: Bigger, Longer & Uncut." The cast includes Jack Black (who plays Jesus), Neil Patrick Harris, John C. Reilly, Andy Richter, Maya Rudolph, Margaret Cho, Rashida Jones and others. Read what the Associated Press says about it here.
Something more serious and even more punchy:
About Proposition 8
No on Prop 8