Well, I just watched the first part of the film and it is, without question, the single worst 'documentary' I've ever seen.
At no point during the first 35 minutes did they present ANYTHING that comes even close to being considered a fact. I looked into the stories of Horus, and a number of the other figures they mention, and all the information I've found is entirely contrary to what is presented in the film. I could not find anything that supports the claims they made concerning the alleged parallels between the life of Jesus (whom the film claims never even existed, despite overwhelming evidence for the contrary) and the other figures. They even overlooked some incredibly basic and obvious facts that blow massive holes in their argument. Like the fact that everybody with a clue acknowledges that although Christmas is celebrated on the 25th of December, Jesus wasn't born on that day. Neither were any of the other figures that they mentioned. for that matter!
It was so far from truthful or factual, that I actually thought the film might have been made as a joke - perhaps the film makers wanted to see just how much they could get away with?
The production value was also dreadfully low. Usually I will ignore something like that if the content is good. The content in Zeitgeist was abysmal. It's kind of ironic, really. The whole film is about people buying into and believing myths, and yet the whole film is based on lies. I don't want to sound like a jerk, but I would seriously question the intelligence of anyone who believed the claims they made in the fist part of the film.
Two minutes doesn't even get you through the intro sequence! 
