I should explain that I am shelving 'The Priest' as bad-disappointing because I was expecting more than the book provided. This is the first novel by Disch I have read but, he was an author about whom I had read things which made me expect something special. What I read in 'The Priest' was not special and that accounts for my shelving choice and three star rating.
What is 'Priest'? A grand guignol of a novel that is a cri de coeur of disillusionment by the author with, mostly, the American Catholic Church. But in making it he has stirred up a bouillabaisse which includes clerical sexual abuse, Opus Dei, clerical hypocrisy, the Inquisition, Cather/Albagensien heretics, SF, time travel, alien abduction, the shroud of Turin, split personalities, Nazis, anti-semitism, host-desecration, Father Coughlin, the Shrine of the Little Flower, Ron Hubbard and Scientology (under nom de plumes), McCarthyism, post WWII Catholic Triumphalism, abortion, and the Magdalene Laundries/homes of restraint. I've probably left things out but there is plenty there, too much in fact.
Also there are numerous mistakes, I can assure you that a medieval Bishop waking up in the body of a late 20th priest would have been as ignorant of the grand Tridentine confessionals he encounters as motor cars, but the mistakes are unimportant. Where the novel fails is in its proliferation of targets, its unbridled anger and complex and never satisfactorily resolved plot. Too many ingredients doesn't make for a spicy mix, it usually makes a tasteless sludge. If Mr. Disch wanted to make a blistering attack on the hypocrisies of the Catholic Church, or anyone wants to read one, then he should read a novel like 'The Brothers' Lot' by Kevin Holohan (I do strongly recommend it). By concentrating on the monstrous treatment of boys by priests in schools, seminaries, orphanages, etc. and that of girls pregnant-outside-marriage Mr. Holohan makes a far more comprehensively devastating demolition of the way the sexual teachings of the Catholic Church has been responsible for untold evil.
The Priest by Disch is a passable thriller, I suppose, I don't read enough of that type of book to judge. What it isn't is an examination of why, or how, except in the most superficial way, the Catholic Church came to be run by so many monsters. Even in terms of the monsters he portrays Disch is utterly conventional. A priest who has spent his life molesting altar boys who becomes possessed by an 'alien' personality or simply becomes a split personality who rapes and murders girls is a monster but one to easily dismissed as a 'rotten apple'. The true evil in the sorry saga of clerical sexual abuse throughout the catholic church are all those who co-operated and turned a blind eye and chose not to see. To put it bluntly who was the real monster of Auschwitz, Rudolph Hoss the commandant or the architects, engineers and clerical staff who designed the crematoria and factories were millions died?