Yep, the RCC is about the only ones who do not support it, but there’s plenty of low hanging fruits still about. You’ll be seeing the push in the Baptist church - that will be where the fight is now. The concept that ‘we should follow society or follow Christ’.
I don’t envy the Baptists, and we’ll see what happens now. I’m not sure how long they will hold out for.
Sorry, the RCC, up to this point, has said that it will go along with the new membership change. That could well change over the next 7 months before the change goes into effect. The only 4 denominations, to date, to specifically condemn the change have been (1) Southern Baptist Convention, (2) Lutheran Church-Missouri Synod, (3) Assembly of God, and (4) Presbyterian Church in America.