M. H. Abrams

Secular thinkers have no more been able to work free of the centuries-old Judeo-Christian culture than Christian theologians were able to work free of their inheritance of classical and pagan thought. The process... has not been the deletion and replacement of religious ideas but rather the assimilation and reinterpretation of religious ideas.

I don't really know what it is about vampires that makes them such a powerful symbol, metaphor, whatever in people's consciousness. But I do know they're tremendously powerful. I mean, there's a vampire on 'Sesame Street.' And Count Chocula. I don't know why it's so powerful.