I believe that the Book of Enoch outlines the general gist of the situation.

>"Fallen angels" arrive on Earth.

>They either racemix or perform genetic engineering experiments on humans. Could this be the source of Rh- blood or other racial differences among humans?

>The Deluge happens.

>We've been enslaved ever since. Dumbed down, weakened, our own history hidden from us.

I'm not really sold on any particular details beyond that. Not sure if the "fallen angels" are aliens or actual demons, but either way, it's obvious that the cabal answers to something that is pure evil and spiritually powerful.