The Greek Word PETROS translated as PETER in Matthew 16:18 is describing a “piece of a rock”, while the Greek Word PETRA translated as ROCK in that same verse is describing a “mass of ROCK!” The apostle Peter confessed that Jesus was the Christ (Messiah) in Matthew 16:16, and it upon that CHRISTIAN TESTIMONY that Jesus Christ has built HIS Church! Jesus Christ is the head of the TRUE CHRISTIAN CHURCH and you need not trust in Peter, whom Rome claims as their FIRST POPE! The Lord delivered me out from the deception of Roman Catholicism in 1989, and He showed me that HE was indeed the ONLY true ROCK that I needed, and I praise HIS name for that. Here are some Bible verses that show us that The Lord God is our ROCK!
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. (Psalms 18:2)
The LORD liveth; and blessed be my ROCK; and let the God of my salvation be exalted. (Psalms 18:46)
To shew that the LORD is upright: he is my ROCK, and there is no unrighteousness in him. (Psalms 92:15)
From the end of the earth will I cry unto thee, when my heart is overwhelmed: lead me to the ROCK that is higher than I. (Psalms 61:2)
He only is my ROCK and my salvation: he is my defence; I shall not be moved. (Psalms 62:6)
Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea; And were all baptized unto Moses in the cloud and in the sea; And did all eat the same spiritual meat; And did all drink the same spiritual drink: for they drank of that spiritual ROCK that followed them: and that ROCK was CHRIST. (1 Corinthians 10:1-4)