Soliton: Good morning. I have no desire to argue with you about your faith. I don't know if what I wrote is a "usual protestant argument," but language is language. For example, the Greek word petra is feminine and could not be a reference to Peter for that reason, alone.
Secondly, John uses the "I am" metaphor 7 times: I Am...the bread of life, the light of the world, the door of the sheep, the good shepherd, the resurrection and life, the true and living way, the true vine. John did not mean that Yeshua, literally, was bread, light, a door, or a vine.