Um, from memory it was just after the laboratory invasion ... the central premise was that seeing the planet wasn't alone in the universe (finally seeing all the stars, and concluding that there might well be many other inhabitable worlds out there) was enough to make the deists crazy and rampage around and destroy the world. (God lied to us, We're not the chosen ones, etc, etc.)
Quite a subtle critique of the dangers of religion as a theocracy.
Still, you are right, it wouldn't be much of a film: films are best with lots of action and less philosophising. :D
http://www.imdb.com/title/tt0455507/
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Hee hee. Harsh, but certainly a viable opinion. Mr Dawkins's film was broadcasted on free-to-air tv recently, and it was certainly good to hear someone talking logically about faith-based matters, for a change.