Who is Urbaal from The Source; a Novel and what is their importance?

Urbaal is a descendant of Ur, living seven thousand years after Ur. He is well respected in his community. According to custom, his first born son is sacrificed by the priests for the good of the community. He tries to placate his wife Timna by buying another statue of the goddess Astarte, saying they will have more children. He is enamored with a slave girl and the priests select him to spend a week with her. He becomes obsessed with her and wants her for his own. At the next selection, the priests choose another man for the slave girl and crazed Urbaal kills him. He is killed by the priests for his crime. Urbaal evolves into the god Baal.