Go back and read your Bible. Christ gives the Keys of the Kingdom to Peter, the first Pope.
Please refer to Matthew 16. Jesus first established His desired method of Church governance and then He identified His first Pope.
Jesus introduced three forms of Church governance and specifically rejected two of them. He first considered the democratic (Sola Scriptura) method when He asked; "Who do the people say that I am?". He received several different answers, John the Baptist, Elijah, still others Jeremiah or one of the prophets." None of them right.
He then introduced and rejected an oligarchical form similar to the Pharisees or Sanhedrin when He asked His Apostles collectively; "Who do you say that I am?" They did not answer.
He then revealed His desired method, a theocracy under one chosen man as God had done since He chose Noah, Abraham, Isaac, Joseph, Moses, David, and Solomon when Peter stepped forward, without consulting the other and said; "You are the Messiah, the Son of the living God."
"Jesus said to him in reply, "Blessed are you, Simon son of Jonah. For flesh and blood has not revealed this to you, but my heavenly Father."
And so I say to you, you are Peter, and upon this rock I will build my church, and the gates of the hell shall not prevail against it."
"I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven."
If you want to discuss the symbolic significance of Jesus delivering this Revelation at Caesarea Philippi let me know. It is mind blowing.
The most unBiblical doctrine of all.