So, when we perpetuate those stereotypes and tropes in our hobby, are we not continuing a bad consequence? No one is saying that Gygax was some closet bigot. I am absolutely sure that he wasn't. But, in the 70's, when D&D was hitting it's stride, and it was being written and edited by ... talented amateurs I guess would be the best way to phrase it ... social awareness and cultural respect weren't even a blip on their radar. They were simply yoinking ideas from every fantasy story and fairy tale they could get their hands on.
And, in doing so, continued the same bigoted themes and tropes that inhabit those early works.
So, sure, we're a couple steps removed from H. P. Lovecraft. Fair enough. But, shouldn't we fix things that we know are wrong? Using a real world religious figures to describe the religious leaders of an evil, violent, primitive groups is wrong. It is just wrong. We know better. And you fix it, not because you're winning points or trying to change minds. You fix it because it's the right thing to do.