On the other hand clerics of Selune automatically bypass a bunch of religion checks in the game. Clearly Selune is a superior deity!

In all seriousness, I do feel like sure, Larian implemented some extra dialogue options for a lot of classes and for a lot of deities if playing a cleric, while at the same time they have not thought about some absolutely obvious interactions:
1) Cleric of Lathander and Astarion, as far as I know you can say absolutely nothing special when he tries to munch on you. Lathander hates the undead so yeah, obviously an oversight.
2) Cleric of Lathander and the entire monastery...
3) Red dragon sorcerer and Qudenos in his humanoid form in act 3.
And there is so much more that I didn't think of cause I have not played all the classes.
But I have to say, clerics of Selune get so many extra dialogue options it's insane, like Selune specific ones. But it also makes sense in a game with such a strong presence of Shar in it.