I, with all due respect and humility, tend to differ your point of argument in proving the Petrine Supremacy in the holy Church. Please note that 'Petrine Supremacy' is a later interpolation in the church and that too adopted as a doctrine in 800 AD by the Roman Catholic church to support their claim of the throne of St. Peter at Rome. No Orthodox Churches accept this concept. The reference to the word 'Rock' as said in Mathew 16:18 has nothing to do with the 'Person'- st.Peter. It is as a reference to the 'faith' professed by St Peter when asked who Jesus was. It is clear from the prayer by the celebrant for the 6th diptychs given in our holy Qurbana Taksa. It reads thus: "Establish us by Thy grace O Lord, upon the 'rock' of the Orthodox faith of the three holy ecumenical synods...." The word 'rock' used in the Holy Bible has always been indicative of Jesus or God(Genesis 49:24,Psalms 19:14,Isaiah 26:4). The rock on which Jesus would build his church has been identified as Jesus himself(his work of salvation by dying for us on the cross.) It seems most likely that the rock refers to Peter as the leader of the church (for his function, not necessarly his character.)You said, "When Christ gave his own name "Kepha" to Simon he was giving him participation in the person and office of Christ". If so, do you believe that St.Peter was given the equal status of Jesus as One of the three 'persons' in the holy Trinity?.Has St.Peter been incorporated into the Godhead? It is sometimes suggested that because the word for 'rock'(petra) differs from the name Petros, the 'rock' referred to is not Peter himself but the confession he has just made of Jesus as Messaish. In Aramaic, however, the same term 'kefa' would appear in both places,the change in Greek is due to the fact that 'petra', the normal word for rock, is feminine in gender ,and therefore not suitable as a name for Simon!
Please try to understand the Bible, tradition of the holy Orthodox Church in its true sense and teach others accordingly.
May God give us more wisdom to undertand His Word.
God bless us,
George Achen, Ireland.
Fr. T.George , St.Peter's &St.Paul's Orthodox Syrian Church.