God exists, even if they were adherents of his Church? Numerous human adherents of many religions including my Church have committed far worse atrocities in history. So why do they survive and why do people keep the faith so to speak?
I think it’s because those of faith have it in things that far transcend the human failings of their institutions that are man made. They know that God gives everyone, religious and secular free will to do right or wrong. They acknowledge the failings of man, but that doesn’t shake their faith in that which is of God and not of man. How else do you explain how a religion grew like wildfire when two of Christ’s original disciples, Peter and Judas denied him and betrayed him before his death.