Here is an excerpt on the subject from my upcoming book, Mystery and Meaning:
BELIEF in VAMPIRES?
They asked me, “Do you really believe in vampires?”
“I know they exist. They walk amongst us every day. They disguise themselves as human; but in reality, they are houses of demons ensconced in bodies of flesh. But their deeds reveal their true nature; and I observe their evil deeds and recognize them for what they are. So, beware of those that thirst for blood. Beware of those who love war and execution, abortion and euthanasia, and "scientific research" involving the destruction of human life. Beware of those who devise sophisticated weapons of mass destruction and invent modern methods of cruelty and torture. Beware of those who seek financial profit at the expense of the poor, the needy, and the weak. They may appear human, but they are in actuality soulless vampires.”
Ummm, Gebre, I think Riddikulus was referring to actual, "real" creatures/beings who are said to suck blood, or mutate between human and animal forms depending on whether it is night or day. What you are referring to are folks whose behavior or means of earling a living are predatory and immoral, and analogous to the creatures of legend and fable of which Riddi speaks.
If I'm wrong, Riddi, please correct me.
Yes, LBK, I'm talking about real undead humans and humans that morph into animals; not demons; not wanna be vamps. The real deal!
Yes, I realize that you were asking about the "real deal" so to speak. But the reason I posted my comments is because sometimes we become more concerned with the question literal vampires and werewolves than with the bloodthirsty and murderous forces that walk amongst us in human flesh. We should be more frightened by the human bloodshed that occurs through "legal" wars, "legal" abortion, and such than about the ambiguity of vampires and werewolves as they are portrayed in mythology.
Now, let me step down from my soap box and answer your question as you intended it to be answered. Personally, I agree with Ukiemeister that all these entities are demonic manifestations. Whether they manifest in dreams, visions, or physical life, they are real just the same. I compare these things to UFO phenomena. I believe in UFO's, but I think they are demonic distractions rather than actual alien life forms.
An interesting point regarding this subject is that some Christian theologians have asserted that Nebuchadnezzar suffered from "lycanthropy" when he went temporarily insane. [see Daniel 4:33] W.A Criswell says as much in his commentary on the book of Daniel. Of course Criswell is evangelical, not Orthodox, so I don't necessarily accept his interpretation. But it's interesting.
OK, thanks for indulging me in my previous soap box.