Well let me see here... there's a lot so I might not have the order right...

[ Cough and, ] So basically the horsemen I mentioned show up and bring about their represented destruction once the world's been subtly taken over by dark elements. Once they show up, all hell breaks loose? Their God's supposed to kill a good third or so of humanity and then all the vegetation of Earth, the oceans dry up... Oh there's also some giant monsters? Then an army of demons... oh, I think Satan's involved? Then some of their prophets and the son of their God comes back to conquer the men and the demons, making an ocean of blood which'll purify the world and make it paradise for anyone who swears fealty to them...?

Something like that, at least.