Catholics think this passage means that Peter is the rock upon which Christ founded his church:
> 17 He saith unto them, But whom say ye that I am? 16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God. 17 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. 18 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.
But it can be interpreted 2 ways:
< 1) Peter means rock in Greek and is the rock upon Christ founded the church.
< 2) Peter means stone in Greek and he is the first stone in the church founded upon Christ. Jesus is affirming to Peter that he is indeed the Christ and the rock of salvation.
Let's compare scripture with scripture and let the Bible decide who the rock is.
> 18And he said, I beseech thee, shew me thy glory. 19And he said, I will make all my goodness pass before thee, and I will proclaim the name of the LORD before thee; and will be gracious to whom I will be gracious, and will shew mercy on whom I will shew mercy. 20And he said, Thou canst not see my face: for there shall no man see me, and live. 21And the LORD said, Behold, there is a place by me, and thou shalt stand upon a rock: 22And it shall come to pass, while my glory passeth by, that I will put thee in a clift of the rock, and will cover thee with my hand while I pass by:
> 8Take the rod, and gather thou the assembly together, thou, and Aaron thy brother, and speak ye unto the rock before their eyes; and it shall give forth his water, and thou shalt bring forth to them water out of the rock: so thou shalt give the congregation and their beasts drink. 9And Moses took the rod from before the LORD, as he commanded him. 10And Moses and Aaron gathered the congregation together before the rock, and he said unto them, Hear now, ye rebels; must we fetch you water out of this rock? 11And Moses lifted up his hand, and with his rod he smote the rock twice: and the water came out abundantly, and the congregation drank, and their beasts also.
> 3Because I will publish the name of the LORD: ascribe ye greatness unto our God. 4He is the Rock, his work is perfect: for all his waysare judgment: a God of truth and without iniquity, just and right is he.
> 15But Jeshurun waxed fat, and kicked: thou art waxen fat, thou art grown thick, thou art covered with fatness; then he forsook God which made him, and lightly esteemed the Rock of his salvation.
> They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up, whom your fathers feared not. 18Of the Rock that begat thee thou art unmindful, and hast forgotten God that formed thee.
> 30How should one chase a thousand, and two put ten thousand to flight, except their Rock had sold them, and the LORD had shut them up? 31For their rock is not as our Rock, even our enemies themselves being judges.
> There is none holy as the LORD: for there is none beside thee: neither is there any rock like our God.
> And he said, The LORD is my rock, and my fortress, and my deliverer;
> The God of my rock; in him will I trust: he is my shield, and the horn of my salvation, my high tower, and my refuge, my saviour; thou savest me from violence.
> For who is God, save the LORD? and who is a rock, save our God?
> The LORD liveth; and blessed be my rock; and exalted be the God of the rock of my salvation.
> The Spirit of the LORD spake by me, and his word was in my tongue. 3The God of Israel said, the Rock of Israel spake to me, He that ruleth over men must be just, ruling in the fear of God. 4And he shall be as the light of the morning, when the sun riseth, even a morning without clouds; as the tender grass springing out of the earth by clear shining after rain
> The LORD is my rock, and my fortress, and my deliverer; my God, my strength, in whom I will trust; my buckler, and the horn of my salvation, and my high tower.
> For who is God save the LORD? or who is a rock save our God?
Judge within yourselves. I think it is pretty clear who the rock is and it's not Peter.