Perhaps the priest is distinguishing between their choir-related actions and the words they use in prayer as part of the congregation. He might feel like he can’t force a parishoner to pray the Our father correctly. (although if it were me, I’d require everyone in a leadership position who might be noticed to do that)And since the choir doesn’t lead that prayer, maybe that’s how he sees their role there. Of course, depending on how loud, unison, or obvious the choir is in this prayer, the rest of the congregation may or may not know they are doing it. I’d be very watchful about inclusive language in the songs though. And I guess you have to decide if your presence in the choir is going to add some faithfulness to the worship of the congregation, or if it is just going to drag you down. Personally, I don’t think I could stand being surrounded by the inclusive language - it really eats at me when I hear it. And if you do quit, I’d definitely tell the choir director and the priest why.