There are two popular ones:
one theory is that in the 14th century, Count Delacla lost his beloved and cursed God and was turned into a vampire. In this case, the history of vampires is only a few hundred years.
The other argument seems to be more credible. In the movie "Dracula 2000", after betraying Jesus for 30 silver coins, Judas regretted it and hanged himself at sunset. But God does not forgive him for betraying his son, making him an immortal but eternally lonely vampire after death, to punish him for his betrayal. Because Judas became a vampire in the dark, he would never see the sun, because he betrayed Jesus for silver coins, and silver coins were his nemesis. Because he betrayed God, he was afraid of all the sacred objects. (Garlic and lily seem to be unable to explain...)
And in "Queen of the Damned" (Queen of the Damned) the origin of vampires is pointed to Egypt, and the explanation of vampires as a genetically mutated virus in BLADE is a rather different version. .
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