And Bujold's whole Chalion series is a fascinating example of doing Religion Is True in a really human and complex way. The gods themselves are demonstrably, vividly true. Every single person in the world is guaranteed a single specific miracle to mark their death. And yet there are still churches with their own structures and hierarchies and teachings and you even get religious wars over human interpretation of the gods. It is a really neat balancing act that I'd love to see more of in fantasy.