As a general response:
This indeed is a passage from a Church of Satan Grotto Masters handbook.
Perhaps this is where (and I mean absolutely no offense) those who play spook show dress up while remaining faithful atheists miss the mark.
All of these deities, symbols, names, etc have been used for centuries because they work.
Whether or not you believe that the Devil exists or not, every time that you hold a ritual using His images, His names, His symbols, you are in effect feeding Him. Think of how many have offered up their own energies similarly but with the belief that He is very real. You are raising up your own energy to add to that so you're belief/disbelief is irrelevant.
In this sense every deity does in fact have Vampiric nature. So to have all of their religions. They have enslaved human beings while feeding off of the energy raised and yes even the blood that has been shed in their name. Because of the length of time (centuries) that this has went on it is why their names, images, statues, symbols, all have power about them.
In the late 80's there was a punk fiction by J.G. Eccarius called The Last Days Of Christ The Vampire that played with some of the more shallow elements of this deeper theme. It could have just as easily been subtitled Jesus Lives Vampires Never Die.
While TSB did have an essay on psychic Vampires, this was a type of human being that LaVey was speaking about. The CoS did indeed still do lectures on topics such as Vampires and for those who have read Michael Aquino's CoS book there was even a ceremonial ritual called The Rite of The Undead that was written by Dale Seago who, at the time, held the title of Priest in the CoS.