So we have sources now, do we? You've been checking up on me. Why the keen interest in someone who may or may not ever have shown up in this dimension?
Angels. This is a heaven and hell type of deal? Seems to me your world takes the bible a little too literally. So if there's the Devil and there are angels, stands to reason that there must also be God. Where exactly is He in all this? Is He the one who brought us all here?
As to the vampires, have to say that the lot of them are. Not all, but most, no argument from me there.