He's a cop but isn't portrayed positively and neither are the police. It's an antihero setting which gives context for why his family hates him and the town thinks he's crazy. He solves one crime and then goes on to help that guy commit the same crime within the same episode as the start of his downfall. Like one of the other characters being an Episcopalian priest and the show dealing with rapture. It doesn't feature either as good things, shows both stumbling toward ruin, and I wouldn't consider it to be a Christian show so much as calling the bluff of their pre-rapture authority.