Yeah, I recommend it. It's a bit low budget, but that doesn't detract from the film IMO. Apparently on the DVD extras there is a commentary by Richard Dawkins.
It's basically contains two themes. He points out how so much of christianity is just plagarized from former religions, and then he also talks about his childhood christian school, and how he's resentful that they drove the fear of god into him at an early age. It's essentially an average guy who grew up christian, woke up one day and said "how in the fk can anybody buy this BS", and so he gets a camera and goes around trying to debunk it all on his own.