Its mostly comprised of folk-tales that old Hebrew tribes passed down the generations. Somewhere along the way they got taken for fact. It doesn't really matter anymore because some people are afraid to even question it. So if something pops up that proves them wrong, its going to cause a lot of chaos.

Revalations would make a cool anime if done right

nothing in my beliefs states that life can't exist outside earth, nor does anything state that God only created this planet.