If you want reference to God as the Rock here are some verses.
Deut. 32:4 He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he.
2 Sam. 22:2 And he said, The LORD is my rock, and my fortress, and my deliverer; 3 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.
Psalm 18:31, "And who is a rock, except our God."
Isaiah 44:8, "Is there any God besides Me, or is there any other Rock? I know of none."
Rom. 9:33, "Behold, I lay in Zion a stone of stumbling and a rock of offense, and he who believes in Him will not be disappointed."
1 Cor. 3:11, "For no man can lay a foundation other than the one which is laid, which is Jesus Christ,"
1 Cor. 10:4, "and all drank the same spiritual drink, for they were drinking from a spiritual rock (petras) which followed them; and the rock (petra) was Christ."
1 Pet. 2:8, speaking of Jesus says that he is "A stone of stumbling and a rock (petra) of offense"; for they stumble because they are disobedient to the word, and to this doom they were also appointed."
You are wrong on multiple counts.
Also, who was called "Cephas"?