sandiegojones said:
Yes, but we're talking about two thousand years ago. How would one come up with UFO's and aliens without having knowledge of electricity or even simple tools?
Believe me, they had way better than simple tools two thousand years ago. The Nazcans did some pretty amazing things (the Nazca lines being one) that still manage to astound people to this today. The functional aqueducts, their pottery, textiles...ancient civilizations were extremely sophisticated. Where do you think all of these legends about their needing gods to come and teach them technology came from?
I don't understand what you would really need to "come up" with UFOs other than imagination. And remember, just because they were thinking of the possibility of otherworldly beings doesn't mean they were thinking specifically of flying saucers or spaceships like the kind you'd find in a 1950s kids magazine. The beings they worshiped just happened to turn out to be aliens, or the aliens thought that what the Nazcans were worshiping were close enough to them that they were worthy of being the chosen tribe.
But anyway, I think either theory makes about the same amount of sense. I'm just happy that the movie was able to encourage this kind of discussion.