I would never say everything in Zeitgeist is complete truth anymore than I would say any other piece of film, printed media or even spoken ideas are complete truth. I mean after all, any such work is crafted by humans .... as was the Bible, Koran, and all other religous texts, a concept which "people of faith" might do well to ponder from time to time.

However, there are many things in Zeitgeist that should at least give one pause to consider some differing possibilities of the stories we have been told about what's mentioned in it.

As always, the best conclusion is one based on studying multiple viewpoints before making any decision about what is the most plausible answer