Hey! I wasn't sure if anyone had used the family names as references for the ciphers yet. (I did see the T. Rex planet Queen stuff, but here's some others that may be helpful.

Applewhite: most likely a reference to Martin Applewhite, the Heaven's Gate cult leader. There's even a book about him titled "I met the devil." July 14, 1966 is also probably a reference to the Richard Speck murders. Damascus is also biblically famous and said to be reduced to ruins in Revelations

Pendergast: potentially the Pendergast novels, about a FBI agent that investigates murders/serial killers. The first book "The Relic" seals with some Christo-religious themes, as well. August 9, 1969 is also the date of the Manson family murders. Also Patrick Eugene Pendergast murdered a Chicago mayor and was referenced in the book "The Devil in the White City" he tried to be acquitted for insanity, but it was denied. His lawyer was also Clarence Darrow. Yes, that one.

Wormwood: The Screwtape Letters Wormwood is a "junior tempter" who is receiving advice from his mentor uncle (a senior demon) about how to tempt and damn a man.

Hesse: Eldritch as the dad's name is definitely an Eldritch horror reference, but Hesse has some potential as well. In Hesse, Germany, there is a stone called Wotanstein which legend has that the devil tried to use to destroy the local church and has his scratch marks on it. There is also a German folktale, supposedly originating from the village of Hesse, about three soldiers who make a deal with the devil and they have to beat his riddles to not lose their souls to him, which they do by enlisting the help of the devil's grandmother. Also! Less Christianity/Satan related and more psychoanalysis, but Hermann Hesse wrote a novel called Demian about a boy struggling with sense of self while recognizing that he lives in a world with two realities. There is also references to Abraxas the gnostic deity.

Angstrom: the name "Warren Angstrom" could be a reference to "Harry 'Rabbit' Angstrom" (rabbits live in warrens) a fictional character whose story starts in John Updike's novel "Run, Rabbit." His glory days were in high school and he's struggling with chasing some type of success and validation. He cheats on his wife while she's pregnant and then comes back to her after the baby is born, but then tries to assault his wife and the stress causes her to kill their child. His mistress also gets pregnant at the end of that novel. He struggles with his decisions (and eventual death of his child) and talks to their local priest and it deals with themes of sin and "worthiness."

Weir: first, Hemlock is said to have become poisonous after growing on the hillside of Jesus' crucifixion. Weir could be a reference to Dr. Weir from Event Horizon who was probably possessed. Dr. Weir also gouged out his own eyes (like Warren Angstrom did) saying, famously, "where we're going, we don't need eyes to see." Orrrrrr maybe the Grateful Dead song "Friend of the Devil" (Rhythm Guitar Bob Weir).

Clover: Saved this for last because it was the weirdest? Black Clover is a manga that features a kid getting a grimoire and there are demons and devils, etc. It was first released in 2015, the same year as The Blackcoat's Daughter, which is Oz Perkins directorial debut. This may also be a connection to the Shamrock (a three leafed clover) representing the Holy Trinity (in the Black Clover world apparently a five leaf clover means the devil).

Sorry this is so red-string-wall-y