There was a lot of information about extraterrestrials and spirituality here, I will repost and reformat some when the time is right.
Very condensed redpill form: We have been ruled by bad aliens through their human proxies and are coordinating a liberation with good aliens. The prophecy is a time estimation of planetary ascension into a higher dimension. Check the first sentence of the wikipedia page for "Apocalpyse". Everyone has a role in this and a choice of which side to align to (light or darkness).