*I post this in response to your unwarranted assertion. I understand you will reject this expert - even though he is a published protestant professor, Gerhard Kittel, who published a ten volume theological dictionary...in his analysis of Matt 16:18, he says...
The obvious pun which has made its was into the GK, text as well suggests a material identity between petra and Petros, the more so as it is impossible to differentiate strictly between the meanings of two words. On the other hand, only the fairly assured Aramaic original of the saying enables us to assert with confidence the formal and material identity between petra and Petros: petra=kepha=Petros..If, then, Mt 16:18 forces us to assume a formal and material identity between petra and Petros, this shows how fully the apostolate, and in it to a special degree the position of Peter, belongs to and is essentially enclosed within, the revelation of Christ, Petros himself is this petra, not just his faith or his confession....In a way which transcends the Rabb. view of Abraham, Peter is brought into this picture of Abraham as the cosmic rock. He takes the place of Abraham, but he does so as the foundation of Israel kata pneuma, the community of the new covenant which Christ builds on the rock Peter.
Theological Dictionary of the New Testament, Vol 6. (Grand Rapids MI, Eerdmans, 1968)
*You are WAY behind the learning curve most protestants experts are on.
Please google Jesus, Peter, & The Keys where all the evidence - PLENTY from prots - is assembled, and buy and read the book
Unlike yourself, I can actually disagree with the preiminent theologians of my faith. I have the necessary theological credentials to do so, but even if I did not I have been a Christian for 30 years now and have studied Scripture since I was a child. I understand context. I have a full understanding of the text. I am a teacher myself. Kittel has an opinion (and I was well aware of who he was before you felt the need to tell me). His opinion is countered by other well-credentialed theologians. Note, Other than going to a Lexicon, I do not scour the internet for support for my position. My position comes from Scripture itself. Your position comes from tradition, with Scripture as a side note IF you can twist it to fit your view. Otherwise, You quote some MAN to me and call it definitive proof. Sorry, I don't accept your "expert" opinions. I have the Holy Spirit dwelling within me and have made it a life-long effort to understand the Word of God. I may not have it right on 100% of what is in Scripture, but I am confident that I am right on the essentials. Why? Because the Holy Spirit testifies to my Spirit that I belong to Him.
1Pe 2:8 and, "A STONE OF STUMBLING AND A ROCK OF OFFENSE"; for they stumble because they are disobedient to the word, and to this doom they were also appointed.