Prelude76's review is spot-on. This movie is FRIGHTENING, probably scarier than 90% of the horror movies that came out in 2006. And it was brilliant in the way that it did not skew the viewer, or use unfair editing, in order to get points across- everything in the documentary speaks for itself. I have read that the fundamentalists featured in the film are happy with the way it came out and do not feel they were portrayed unfairly- but anyone with half a mind will be able to spot the hypocrisy and irony hidden throughout. (The best example of this is the lead evangelist going on the radio arguing that her indoctrination of children is not political at all; this follows a scene where she produces a cardboard replica of George W. Bush at her bible camp.)
I recommend this film to anyone who has even the slightest interest in uncovering a disturbing sector of the American public.