Did the gates of Hades prevail against the post-Christian churches?

Jesus promised in Matt 16:18, "And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it." If a church like the Episcopal, Evangelical Lutheran, Presbyterian (USA), or United Church of Christ promotes prenatal infanticide and ordains men and women openly practicing homosexuality, has that church lost the battle with Hades?