god doesn't need to be presently miraculously intervening to make deliberately taking on his curse and damnation a stupid idea
(though he does in the only gehenna scenario worth anything, full on passover-ing all vampires except the few who truly repent)
you're taking single statements or other gamelines - like demon, the least relevant of all of the owod's multi-book lines - to try and reject a core theme of vampire:
being a vampire means you are fucked
temporally, in that higher-generations are always at the mercy of their elders and their own hungers and elders are always watching for diablerie, morally, because sustaining your existence is ethically dubious at the best of times, and, ultimately, for those vampires sitting at the top and unconcerned by morals, spiritually, because you are under the curse of god.
choosing to be a vampire makes you a moron