Twenty-five, thirty years ago I would've agreed with you. Would've said much the same thing, in fact. The argument is so common that it's essentially programmed as a response.
After a lifetime I've come to recognize the position as sophomoric. There's a lot more to it.
But I suspect this isn't the place for a discussion about values and religion.
In short, I will say that the sexuality within BG3 fits its time and place. That is not to say that I think we are in a good time and place, but BG3 has little to do with that. BG3 is an excellent game with strong writing that reflects where we are in society. That is the most it can be asked to do.