Katzpur
Not your average Mormon
I don't think the question should even be "who?" but "what?" Let's review the conversation as recorded in Matthew 16:13-19.So now you know that there are varying answers to the question of who the Church was built on. I would again refer you to the Bible verse that clearly states it.
When Jesus came into the coasts of Caesarea Philippi, he asked his disciples, saying, Whom do men say that I the Son of man am? And they said, Some say that thou art John the Baptist: some, Elias; and others, Jeremias, or one of the prophets. He saith unto them, But whom say ye that I am? And Simon Peter answered and said, Thou art the Christ, the Son of the living God. And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven. And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it. And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.
I don't believe Jesus Christ would have built His church on some other human being. In other words, Jesus Christ's Church would not have been built on Peter. Of all the disciples, Peter alone recognized that Jesus Christ was "the Christ, the Son of the living God." And Christ's response to Peter is important, because He commends him for having received His knowledge, not from another human being (i.e. "flesh and blood") but from God himself. In Christ's absence, whoever led His Church would have to receive constant direction from God, as would be revealed through the Holy Ghost. Therefore, I believe the "rock" Jesus was referring to was the rock of revelation -- the only way Christ's doctrines could remain pure and not end up getting contaminated with the philosophies of men. Jesus knew from Peter's answer to His question that he was the one ready to hold the keys of authority. He knew Peter would rely on revelation from on high, and not on the opinions of mere mortals (not even the other apostles).