This is absolutely correct.
If Chénier hadn't insisted on the Aztec-inspired naming and such, I honestly don't see any good reason why his original Blood Cult ideas wouldn't have fit Dwilight just fine. From what I can remember of the basic principles, they were pretty abhorrent to modern Westerners, but would be relatively reasonable to a medieval non-Abrahamic society.
Not to mention in a society where monsters and undead are a fact of life, and seasonal renewal has always been a point of contention. (Hell, look at most early harvest religions, period. King/noble-sacrifice-and-rebirth is everywhere, and not always only symbolic.) But I'm pulling us off-topic, I think.
