I've finally started looking Zeitgeist from the beginning (I'd only watched the part about banks so far) and all I can say is: holy crap. The introduction to religions left me speechless:
http://www.youtube.com/watch?v=T4PuEbAJipE (That's the English version with Italian subtitles, I'm sure there must be other versions with different languages as well.)
I mean, one of my exams in university was sociology of religions, so I think some of the stuff they're going to talk about in the next parts won't be completely new to me, but seeing the origin of religion explained like that. Just, wow.
I can understand why they're never gonna show this documentary on TV...
EDIT: And it gets more and more interesting!
http://www.youtube.com/watch?v=hu6vTWItFms