Jack didn’t fully get Jesus. Audrey tried to explain it, and he could repeat it back to her, word for word, but he still didn’t comprehend most of it. The best he could gather was that Jesus lived long ago, told people to be nice, and they killed him for it. At the end, he asked who was Jesus’ necromancer and if he was in the Bible, then Kaldar couldn’t stop laughing and had to sit down.