The other churches ARE deficient. So is the RC church.
All churches and all men are deficient. Why does the left constantly harp on this? I believe its because the left is the tool of Satan. All of their moral relativism is as old as the lies of the serpent in the Garden. It's nothing new. The doctrines of the left permeate the Bible as the works of Satan. Anything you hear from socialists around the world is right there.
Sure, they are going to trot out that Benedict was in the Hitler Youth. So was everyone else in Germany (not that it makes it right). I'll watch to see how he reacts to that. If it's a "sure I was, I sinned" more power to him! It's nice to know I've got something in common with the Pope; he's a sinner just like me!
We're all sinners. And we can all be saved from our sin by the intercession of our Lord Jesus. That is the one absolute truth that the moral relativism of the left is absolutely terrified of.