Ya, that was my first problem with the movie. You take 3 seconds to look into any "fact" and it turns out to be bunk. Gotta love all that nonsense about Jesus ushering in the age of Pisces or whatever... given that it wasn't until the 5th century that Ptolemy hammered out the basis for today's supermarket astrology. Oh, the fact-checking could be endless... which turns it into a huge time waster (above and beyond the 2 hours of your life sucked away by watching the movie itself).
Of course, this is the Internet. Someone else has already taken care of all the hard work:
http://www.conspiracyscience.com/articles/zeitgeist/
Grand insight from Part 1 of Zeitgeist? Christianity did not spring forth uninfluenced by previous religions. Woopity do. This might be news for Evangelical American bible nuts. The thing that struck me here is that... well, the movie does such a bad job of ripping Christianity apart. It isn't that difficult to point out the logical inconsistencies and expose Christianity as a manmade religion (just like all other religions). Still, it fails.
The rest I could write about but who cares... it's all bullshit for non-experts. I mean, really. Any engineers or economists out there able to do any first-hand fact-checking and number-crunching? No, probably not.
Anyway... where are those microchips?