Have you read "The Twelfth Planet" series? They're all books on the subject of Ancient Aliens being our true gods and creators, and they look at Nibiru in depth too and all the mythology and modern day religion that actually supports the theory. I think this is an extremely interesting and intriguing topic, and to me, it makes more sense than a cosmic accident or a spiritual creator.
Now, about the end of the world.... I'm skeptical about anything to do with that. But I don't think it would really matter if it really was going to be the end, we couldn't stop it. and plus I'm looking forward to dying when it happens, I see death as man's final frontier. It's said space or the ocean is our final frontier, but we know more about space and the ocean than we do about death or any sort of "afterlife."
This is all very interesting to read about though.