The thing that I find to be confusing is traveling back to the past and finding out about LaVeys beliefs in the literal existence of Satan? I find it hard to believe in a persons own story of who'm he knew him quite a while back in the COS. I am not necessarily trying to start an argument but I find it rather confusing at times if LaVey believed in the existence of the Prince of Darkness. We do however know LaVeys circles of people who were interested in mysticism and esotericism. I do think that the doctor Aquino is a very truthful man whether or not I think it was a sad decision of him leaving the Church of Satan I can probably understand his own experiences and his esoteric belief.
Aquino didn't want to leave the Church of Satan, but when LaVey began selling the Satanic Priesthood (you send him $1,000 and he'd ordain you to the Priesthood of Mendes), well this was intolerable to Aquino and most of the original CoS priesthood so they resigned, but took the priesthood with them and soon after they established the Temple of Set. I think this was a major blow to Anton LaVey who in his later years became more atheistic and reclusive.