If vampires ever did or do exist,
They don't, quit worrying about it.
the translation of “vampire” for Christians is “demon.”
I wasn't aware that "christian" was a language in and of itself.
Is this what we want occupying our daughters hearts and minds, even in a fantasy world?
As if you had a say in what occupies your daughters hearts and minds.
Romantic obsession with a demonic presence?
No, romantic obsession with a fictional crfeation. I would prefer that to romantic obsession with the neighbor boy by far.
The blood thing really should bother us for other reasons.
Why yes, lets not have any symbolic drinking of blood. Whoops... too late.
We have an epidemic of cutting as a well-known adolescent pathology
It is, but it certainly isn't because they saw a vampire movie.
I believe there are spiritual issues involved. These kinds of strange maladies look a lot like demonic activity.
It's not a virus, and it's not because they saw a vampire movie and got possessed by a demon. Take your kid to see a therapist, not a priest.
We continue to hand our kids over to the mental environments of death. Unless we change course, they will see spiritual twilight indeed.
You really do just make this shit up as you go, don't you? If your kid is having problems then berating her about demons is likely going to more harm than good. Quit making up bogeymen to blame and deal with the fact that any problems are more likely closer to home and a lot more terrestrial.
Moreover, teenagers have a hard enough time with the changes that come with puberty, hormones kicking into overdrive, and the confusion and mood swings that come with it.
Trying to blame it on some ethereal "demons" or evil romantic vampire books and movies will just make you seem even more out of touch and result in you kid being even less comfortable bringing any problems or questions to you when you are going to preach at her.