I researched Martin extensively - including pulling a lot of his work from the Simon and Schuster papers in the NY public library.
Fraudster and liar - from his claims of being an exorcist to his claim to have priestly faculties. All lies to sell his books.
I don’t know who your source material was, but they are completely off. Not only did Martin work directly in the Vatican himself with direct access to two popes, he had many direct sources. He not only performed hundreds of exorcisms himself, he knew of thousands of other cases through his priest network. Moreover, he was highly sought out by those victims and families who needed the service. His book, Windswept House was “faction.“ It was real characters with different names describing real events. You don’t take on the corrupt Vatican and not have an army of critics descend upon you.