A casual observer of supernatural themes in movies, television, and literature could easily conclude that angels are simply enhanced humans with wings, and vampires are merely enhanced (if anemic) humans with fangs. They’re superheroes.
Today’s vampires aren’t forced back by crosses and holy water; to have that, you’d have to include the whole raft of Judeo-Christian mythology. Because we’ve lost our sense of proportion, it would be considered proselytizing, and that’s just evil. It wasn’t long ago that Fright Night came out, and with it a vampire that suffered injury from symbols of holiness (the way vampires used to). Before that, we had The Exorcist, where Catholic priests were the good guys who used the power of God to exorcize a demon. Try to find a sympathetic portrayal of a priest in mainstream television, literature, or cinema these days, where it’s still considered brave to create a priest character who molests children or does something equally horrible.
In Supernatural, mumbled pseudo-Latin and nonsense-inscribed pentagrams are sufficient to exorcize or trap most demons, and the angels, as charming as some can be, are no different morally than the inhabitants of the infernal realms. What’s interesting in the Supernatural universe is that demonic possession can be cured through the use of sanctified blood, and holy water burns the possessed. In an early scene in the episode Soul Survivor, we even see a Catholic priest, rosary and all, blessing bags of blood at a blood bank. Where did he get the power to sanctify the blood? It’s never explored. They have to gloss over it. If angels can’t bless things, how can priests do it? Got me. Ask the writers.
Modern media’s deliberate avoidance, if not outright shunning of Judeo-Christian ethics as expressed in the Bible has altered the landscape of horror, shifting its moral center to nihilism. Torture porn like the Hostel series, ultra-violent mumblegore like You’re Next, dystopian zombie melodramas like The Walking Dead, and any of the ghost stories produced in the last fifteen years prove this out. Ethics are derived from expediency, with no ultimate moral arbiter.
Horror’s big enough to contain all these things and still scare you, and you don’t need the God of the Bible to tell you right from wrong. Nevertheless, what we’re seeing is the horror genre reflecting today’s cultural norms in ways that, it can be argued, dilute its unique power. If vampires, angels, and demons are just more powerful humans, why not make them aliens instead? Or X-Men?