Hi, I understand your doubts, so I would like to be as clear as possible.
Satanism DOES NOT perform a reverse function of Christianity! Christianity perverts original Satanism (which precedes it) by stripping spirituality of all its components in favor of fictional characters who have no importance.
Christianity does not offer a yardstick. It is not a comparison and there is nothing there that resembles or recalls true Satanism.
That being said: there is nothing about Satan that is "not holy". Satan is the God of Gods and the supreme God. He is not "not holy" and Satanism is NOT desecrating!
And the way Christianity understands spirituality is perverse and false and should not be considered the archetype by anyone. Many things related to the "holy spirit" are stolen from the satanic doctrines of the Kundalini serpent (below I insert a useful link to understand what Kundalini is and what I am talking about). There is no "unholy spirit" and no "holy spirit", etc.: Christianity corrupts Satan's spiritual knowledge.
About Kundalini:
About the "relationship" between Satanism and Christianity:
Who is the real thief:
Fake claims in Satanism:
Fake claims by Jews: