I don’t know that he was a Satanist. I don’t think so.
“Resettling in America in 1974, he started a new life based on a different kind of turn-on—meditation—and his own synthesis of Buddhist, Hindu, Advaita, and Sufi teachings, and later, Jewish mysticism.
The key words here are “his own.” This is not of God. It is against God and thus is of God’s enemy, Satan. Mr. Alpert and his fellow-travelers promoted psychedelic drug use and paganism to an entire generation while denying and denigrating the one true God. It does no one any good to deny this or try to water it down.