I am speaking as one who was 'raised Catholic': baptized as a child, first communion, confirmed, sang two Masses a day, celebrated advent, lent, the stations of the cross, crowning Mary May queen, Easter, Christmas, and twelve years of strict Catholic education, etc. I have spent a lot of time searching for God. I went from there, to nothing, to the charismatics, Mormons, JW's, 7-Day, Messianic Jews, and pentecostals. It was the latter three that actually started introducing me to serious bible study. I didn't so much seek these religions but worked with people who espoused them and as such got drawn in because of my great lack of relationship with 'knowing Christ'.
I will simply address Peter here. Simon, later surnamed Peter, was a non-religious Jew, a Galilean, chosen by Jesus Christ to 'follow him' and after Jesus death was given the authority and leadership of JEWS who followed the teachings of Christ. It was PAUL who was given the ministry to the 'uncircumcised' - the Gentiles:
Peter was dead by a few hundred years at the establishment of the RCC. He had no hand in its establishment. It would have made more sense to have Paul as the first Pope, as he carried the gospel to the uncircumcised, (non-Jews to include Romans) and also having been born in Tarsus claimed Roman citizenship.
Galatians 2:7 But on the contrary, when they saw that the gospel for the uncircumcised had been committed to me (Paul), as the gospel for the circumcised was to Peter
Galatians 2:8 (for He who worked effectively in Peter for the apostleship to the circumcised also worked effectively in me toward the Gentiles)
The focus of our faith is Christ. The problem I have with 'anti-Christ' is this. Whether Catholic, Protestant, even the considered cults, Mormon, JW, etc - - they ALL RECOGNIZE the authority of Christ no matter how skewed the doctrine. On the other hand both Judaism and Islam are the major ANTI-CHRIST espousers. The Jews are beloved for the patriarch's sake (Romans 11:28) but enemies of the gospel. The Jews are essentially non-confrontational due to their smaller numbers while the Islamics, with vast numbers, are ardent in their anti-Jew and anti-Christ stance.
Whether Jew or 'Christian' we, like Paul, need to consider the 'upward call in Christ. Paul was one of the highest religious scholars of all time - but he considered it 'all dung' for the upward call in Christ. Should our attention be on the differences of our 'brothers' - or should it be directed to those who are our enemies?
It is sad that a distinction need be made as 'Catholic, Christian, Protestant, non-denominational'. We should limit our thinking to 'Christ - or NOT Christ'. He is our life - or He is NOT our life. I have learned that I will never change a person's 'religion'. My hope is to simply share Christ that it will strengthen our belief in Him.
Jeremiah 20:9 " But His word was in my heart like a burning fire Shut up in my bones; I was weary of holding it back, And I could not.