Christians like to call hindus, buddhists, psychics, kundalini, yoga, Star Wars, The Force, etc. “THE DEVIL”. And as their own scriptures say, “He that blasphemes the Holy Ghost has no forgiveness, for he has committed an eternal sin.” “Because they said He had an unclean spirit” (The Devil).
So, you can spread the word among occultists these people are calling everyone outside of their ‘impotent’ belief system ‘the devil’.
(I know experientially what I am talking about here. OVER AND OVER, YEAR AFTER YEAR).
You can also surround yourself with grey energy, then, when you have got lots of it gathered, you can throw it at the church or person(s) involved. (This technique, I got from the Joy of Satan site).
E A Koetting tells of a person that would sit in a church and vampirize the energy in the church that was thrown around by worshipers. Just suck in the energy. In the BALG ebook, Koetting tells how to imagine a line hooking up to a person or persons and sucking them dry. Visualizing their energy as blue and when you inhale, you suck their blue energy (or gold, or white) into yourself, and on the exhale, you keep the energy in yourself.
The Joy of Satan site has a similar technique where you hook up the energy line to the person (preferably while they are asleep, as their psychic defenses are down.) Then you suck them dry.
You can also find something criminal about them to use legally.
Just some options.