Second passage that caught my eye:

"So the king holds the keys of the kingdom, but he delegates his power to the steward, and the keys of the kingdom are the symbol of this delegated authority."

Yes, but the stewards are chosen by the king or by a prophet (IIRC), NOT by a bunch of corrupt, pretty hungry politicians, or for the Christian context, by fallible, often outright evil earthly kings. So, I can concede that if God appointed a man to be the Shepherd of His people, cool, but, the pope, historically, has absolutely not been that person.