Father Kassad is the main villain of the story. Kassad is 51; he is the local priest and cult leader. He also is the director of the House of Rosette orphanage. He takes deep care of the orphans, especially those he deems special - the ones he sees as future cult leaders. Khaleb was seen as one of the special ones, him and the priest had a deep connection, he even saw Kassad as his biological father.
Kassad does try to act fatherly and lovingly around the townsfolk. Almost every local has a positive thing to say about him. Father is hyper-aware of people's body language, he can easily sense if you're feeling uneasy or nervous. He can be obsessed with his victims and stalk them for months on end - that's what he has done with Khaleb. Kassad dislikes Vance, he deems his behavior as rebellious and disrespectful.
Kassad is absolutely obsessed with the False God which he worships, he wants to spread his twisted version of Christianity upon everyone. The more followers the better. That's why he has struck a deal with Harlington - he uses him for money for his cult, their relationship is not that of ordinary. There's tension between the couple. He's great at keeping the CEO in his place and making him listen to him.
Since his cult worships the False God, every few months โa sacrifice is neededโ so that the God can be โsatisfiedโ. Kassad carries a dagger with him (it's attached to his lower leg) at all times. It's the weapon he carries out his missions with. If anyone dares to disagree with Father, he deems them to be a โsinnerโ or a โhereticโ. Only his word is holy.