(CNN)Early in his salacious new book about homosexuality in the Vatican, the French journalist Frederic Martel asks a source to estimate the number of Vatican clergy who are "part of this community, all tendencies included."
Salacious new book says homosexuality is rampant at the Vatican
"I think the percentage is very high," says the source, identified as an Italian journalist who left the Vatican and the priesthood after he was discovered viewing gay sex websites on his Vatican computer. "I'd put it around 80%."
That estimate from Martel's book, which is scheduled to be published on February 21 in eight languages and 20 countries, has already made international headlines.
CNN received an early copy of the book, whose English title is "In the Closet of the Vatican," through a source. Neither CNN nor the source agreed to sign a nondisclosure agreement with Bloomsbury, the book's publisher in English, nor any other publisher.
While there has been no shortage of sexual scandals in the Catholic Church, mostly concerning the abuse of children, there are no reliable studies on the number of gay Catholics in the priesthood, mostly because church leaders won't allow them.
In that sense, Martel's book could have provided valuable insights. He says he talked to 1,500 sources, including 41 cardinals, 52 bishops and 45 current and former Vatican ambassadors, or nuncios, during his four years of reporting the book.
But is that 80% figure really true? And what, exactly, does "all tendencies included" mean? Remarkably, in a 576-page book, Martel, who has written widely on LGBT culture, never returns to that estimate, nor does he try to ascertain its veracity.
Instead Martel dedicates more ink to ruminating on the presence of a rainbow colored umbrella in Casa Santa Marta, the Vatican apartments where Pope Francis and other high-level Catholic officials live, than trying to determine whether his source's estimate is true.
"I imagine the scene: its lucky owner, perhaps a cardinal or a monsignore, takes his stroll in the gardens of the Vatican with his rainbow flag in his hand! Who is he? How dare he?"
Like that passage, the book is light on verifiable accounts and heavy on innuendo. At times, it reads like French social theory translated by Page Six gossip mongers. One prominen