Who is the founder of the Lord's church?
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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.
(Mat 16:18)
For other foundation can no man lay than that is laid, which is Jesus Christ.
(1Cor. 3:11)
And he brought him to Jesus. And when Jesus beheld him, he said, Thou art Simon the son of Jona: thou shalt be called Cephas, which is by interpretation, A stone.
(John 1:42)
And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ. (1Cor. 10:4)
Peter means a small stone, pebble (Greek, Petros) (John 1: 42). When Jesus said, "You are Peter" he is saying you are a small stone but upon this Rock (Greek, Petra), Christ was pointing upon himself as the huge Rock. "This" is a demonstrative pronoun referring to the nearest person and he did not say, "that rock", he said "this rock", referring upon himself as the solid foundation (I Cor. 3: 11).