This is an interesting paradox I've noticed. Would you give me your thoughts on it?

I believe there exists demented, delusional, human individuals, with the belief that they are vampires. This includes both male and female delusional. I also accept that not a few of these out of reality indulge in ritualistic behavior for accessing a source of human blood. Now then: A vampire bite is not believed to be a cause of the death of the victim. It is believed the bite will result in infecting the nutritional donor with the disease of "vampire-ism". It is a behavior I find no less disgusting than the ritualistic partaking of human flesh. So, a "christian" vampire has created no "sin."