The Blasphemy Challenge is one of many interesting uses of Youtube’s video reply functionality. A bit silly, it challenges viewers to upload their own videos where they “deny the Holy Spirit,” an unforgivable sin according to the New Testament. Up to 1,000 responders will get a free DVD of the documentary The God Who Wasn’t There.

This kind of decentralized collaboration will become really interesting when people can actually start to, well, collaborate: i.e., turn many small snippets of video into a documentary. Even now, it’s an interesting display of the new media culture that is arising on the Net.