Ultrachrist!

This ultra silly, very low-budget comedy sometimes felt like a Lenny Bruce bit brought to life--he used to do sketches on what would happen if Jesus came back. The humor isn't exactly inspired but there are enough laughs to make this one a pleasant surprise for people who aren't easily offended by religious themed humor.

Ultimately the movie is no more irreverent than what they do with the Jesus character on South Park, so I doubt that too many people outside of the bible belt will really have a problem with this.

If you're looking for something fun to rent you could do a lot worse than Ultrachrist.