I've not had much interest in Whitley Strieber. I did read
Communion and I saw the film with Christopher Walken. Whitley was raised in catholic school and it obviously had a major formative influence, including the name of his book
"Communion." Strieber's early novel,
"The Night Church" (1983), was about a catholic church that by day was normal, but by night was used by a cult involved in "a centuries-old Satanist conspiracy to rule the world." This idea would have been cooking in Whitley's mind during the decade of the book and film,
"The Exorcist."
Then too, in 1976 a book came out by a former Jesuit, Malachi Martin, called
Hostage to the Devil: The Possession and Exorcism of Five Contemporary Americans. Martin's book purported to be actual stories of exorcism, but to me it comes across as highly embellished. I should say that as a non-catholic I was once involved in a non-catholic impromptu exorcism, and there were very strange phenomena. So, I don't dismiss the concept, but Martin's journalistic license to embellish makes for a salacious, novelistic horror story, which is off-putting to me. Anyway, I'd guess that Strieber read Martin's book, probably when it came out, and that it probably has had a lasting impact on him. You cannot "un-see" what you've seen. Strieber does say at his website that he was acquainted with Malachi Martin. Of course.
Following is an excerpt from Malachi Martin's book, which might call to mind some of Whitley's most unusual reported experiences, though I leave it to the reader to make connections. A catholic priest, father Gerald, and his assistants, were attempting to perform an exorcism on a demonized victim named Richard/Rita, and the demon literally attacked and physically injured the priest. I've added a few words of context in block quotes to help clarify the text.
The Girl-Fixer [a demon], invisible to [the priest's eyes], was on him, two claws clutching at [the priest's] middle. [The priest's] assistants heard the raucous laughter. They held their ears. But Gerald’s agony they could not know. All they saw were Gerald’s sudden, violent spasms backward and forward “as if his middle was caught in a vise”; then the screeching shredding of his cassock and clothes, leaving him naked from chest to ankles. After that, all details escaped them in the violent jerkings and writhings of his body.
Gerald felt one claw [of the demon] was now totally sunk in his rectum. Another claw held his genitals, stretching his scrotum away from his penis, jerking at him brutally. Both claws were stiff, cutting like the jagged edge of a tin can, driving deeper and deeper, impaling him. He reeled away from the couch where [the possessed victim] Richard/Rita lay laughing, laughing, laughing, kicking the air and thumping the couch with clenched fists in deafening bursts of merriment. Gerald staggered zigzag across the room, bent like a jackknife, involuntary screams gushing from his throat. One claw rocked back and forth within him. Slivers of agony jabbed and pierced through his buttocks and belly and groin, as flesh and veins and mucous membrane and skin tore and ripped irregularly.
Martin, Malachi. Hostage to the Devil: The Possession and Exorcism of Five Contemporary Americans (p. 173- 174). HarperCollins. Kindle Edition.
Hummmm . . .
It seems possible that as a writer seeking "inspiration" Strieber may have unintentionally attracted powers of darkness to himself that continue to affect his mind.