*topic moved to Body, Mind & Spirit*
According to Tibetan Buddhist cosmology, it is not only possible, but everyone who is currently a human being probably lived at least one life as an infernal being. According to this cosmology, humans are not weaker than demons. It's the other way around. Human beings are more much more evolved than demons.
As for the subject of human blood and demon-origins, I think you're starting to venture into White Wolf-ville there.
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