The lunar conquest of southern Peloria brought tens of thousands of olranthi into the folds of the Empire, a people whom one of their two major cults was forbidden. I get that the orlanth ban can't be a 100% effective, and that in the Provinces there must be thousands who secretly still worship him, but as it is stated in the Guide, most people have dropped his cult and now follow the one of Barntar, or other earth-based deities.
Also, even if lightbringer worship isn't forbidden altogether, the Seven Mothers cult offers almost identical (some would dare say plagiarized) deities whose worship definetly would make your life easier now (Issaries - Etyries, Humakt - Yanafal Tarnils, Lankor Mhy - Irrippi Ontor, and so on), as that would make that hateful dara happan tax collector friendlier to you, and probably be the only way you can climb in the social rank.
How do you think the spirits of reprisal act in those scenarios? Also, what is the human side of the mass conversions issued by the lunar empire?