Disagreements about things happen all the time. The issue becomes one of offense. How far will the religious person go to insist that the other person’s personal beliefs and life existence is false?
Again, I resort to analogy. What if I were trans and your religious person continued to call me by my deadname because their religion says to do so? Do they somehow get to make the claim that I should not take offense because it’s their religion and that overrides my life?
If you find that distasteful, let’s stick to religious views of other religious views. The LDS has been found baptizing holocaust victims. Many Jews found this offensive. Why to you should they? It’s just an LDS belief that hurts them in no way.
I would normally assume that if I told a Jew that from my perspective I found it offensive to be considered a member of a religion I am not, they would honor my belief and refrain from doing so. I am telling you this.