Thanks, yes, I got that from wikipedia too, so I was wondering whether you were asking if I thought the Joss'verse vampires were supernatural beings, between mortals and gods?
I think the idea I am playing with here is that they are a demonisation of the human, rather than a demon taking possession of the human body after the human's essence has departed. Does that make sense?

edited to make it slightly more coherent. Sorry for the spam