For years now, Negativland have been a collective of audio pranksters whose electronic, sample-laden musical constructs have taken the notion of satire into heretofore unexplored realms. Occasionally they've even gotten into legal hot water, at one point being sued by no less than U2. Among atheists, they may best be known for the outrageous "Christianity Is Stupid," which centers on a looped sample of a fundamentalist pastor blathering the song's title (taken, of course, shamelessly out of context from the sermon it was part of, but when you're a satirist, you get to be shameless).
Now Negativland have upped the anti-religion ante from that track on It's All in Your Head FM, a double live CD taken from two public performances of their weekly radio show Over the Edge. This is hilarious and yet strangely compelling stuff, and sharp listeners might spot similarities to some of Frank Zappa's work. But Negativland have a transgressive quality all their own.
This clip only barely scratches the surface of what's on this set. It really is required listening for atheists, so be like the cool kids and buy now. Hell, you could even pick one up for a Christmas present to a Christian friend of yours, depending on how badly you want them to hate you.
(PS: If the track doesn't play, odds are my daily bandwidth allotment has been exceeded. Just come back another time.)