Yes, I saw it. Very interesting and disturbing to see what these people are doing to children's minds with their literal interpretation of the Bible and Christianity.
The documentary in not a Channel 4 production but was screened on Channel 4 here in the UK. The film has been shown prior in the states where it created a controversy and was nominated for an Oscar for best Documentary Feature. Here is a Wiki
Jesus Camp.
Pastor Ted Haggard is interviewed and comes across as a typical self-righteous minister who preaches, "we don't have to debate about what we should think about homosexual activity. It’s written in the Bible." Having heard him say that, it's worth watching this documentary just to see how it ends (if you don't already know).