Understanding ghe vampire phenomenon

The Hebrew Bible, a.k.a.. Old Testament forbids the eating or drinking of blood as "the blood is the life." Under the Jewish dietary laws, animals must be bled out or the meat is not kosher. Blood sausage and blood pudding are forbidden to Jews. Yet, there are people who do eat blood and even use it in their sacrament: Christians.
What is a vampire? A creature that enjoys everlasting life on earth by drinking the blood of his/her victims. For the Catholic in particular, through the Eucharist, the drinking of "the blood of Christ" is essential if Christ the Savior is to provide everlasting life after death. So there's a parallel here: drinking of blood, which is forbidden by the Bible, is a means of achieving eternal life, either on earth or in heaven, depending on whether you are a vampire or a saved Christian.
To my mind, the idea of those horrible, blood sucking vampires is a subconscious aversion to the idea of drinking blood, period. It's against the Bible, a heresy if you will.  If you believe the drinking of blood is forbidden, the act of drinking "the blood of Christ", the Jew, is a forbidden, disgusting, primitive act.
No wonder then that people fear vampires, and ward them off with the Christian cross.
This is also related to the infamous blood libel, the belief that Jews use the blood of Christian children to make matzoh. The earliest blood libel I remember is Hugh of Lincoln, believed in Chaucer's day to be a saint, a child murdered by Jews for his blood. The Catholic church has since rescinded any saintliness of the apocryphal Hugh of Lincoln, but the blood libel persists. Jesus, of course, was a Jew.  Jews, forbidden to eat or drink blood, would not use it in any sacrament. The blood libel, blaming Jews for drinking blood or putting it in matzoh may also stem from the aversion to the symbolic drinking of Jewish blood in the Eucharist.. It's a form of psychological transference.
Someone recently posted a cartoon of a mosquito who got power from sucking the blood of a Christian. Presumably that would a a "saved" Christian. Now you have the tools to analyze that one. Go for it.