This got me thinking so I did some research online. From what I could gather, it's not agreed by anthropologists that the Aztecs saw Cortez as a God, the earliest sources of this idea were written 50 or more years after the Spanish conquest. They did believe in a God named Quetzalcoatl who was light skinned, but he was also a feathered serpent. Most of the ideas of the Spanish being seen as gods were first popularized by Spanish priests, once again many years after the actual events. By the way, Mormons around here use the same white God idea among the Aztecs to "prove" that Jesus visited the new world, which the Book of Mormon claims. The Aztec calendar says nothing about the end of the world, it just comes to and end at a certain point and there's no real evidence that they thought the world would end at a certain time. To me this shows that you can take anything from the Bible, ancient calendars, history, or mythology and use it to make up and authenticate your own religion, or to reinforce any theory that comes to mind-like the one about the world ending in 2012.
BTW-wasn't the world supposed to end in 666, 1000, 1666, and 2000 too?