A funny and insightful shot at philosophical Satanism. He synthesizes a lot of old texts from Canaanite mythology and ancient Israel into a story that serves the format of a spiritual life for a skeptic. It reminds me most of Nietzsche's Thus Spake Zarathustra. Temple Satanists and/or ex-Mormons, or any former Christian/Abrahamic theist, would be the target audience here. But anyone adjacent to these or merely curious would enjoy it.
It also helps that I know the author, nice guy.