Only the Catholic Church makes the claim that Peter was the first Pope. But what the Catholic Church cannot do is prove Peter was the first Pope and that all Christiandom accepted the supremacy of the Bishop of Rome.
The Catholic Church believes in the immaculate conception, the Greek Orthodox Church does not.
The Catholic Church headed by your Pope is the cause of more atrocities in human history than any other group.
Who instituted the inquisitions? One of the quotes on the site you linked to is from St. Jerome: "Ignorance of Scripture is ignorance of Christ". What does Scripture show Jesus taught about those who reject His truth? Who instituted the Crusades? What did Jesus teach about dealing with your enemies? The Catholic Church attempted to set up a religious government on earth headed by the Pope. Jesus said "My kingdom is not of the world". Jesus instructed us to pray to God the Father, not dead human beings.
The Catholic Church's ignorance of Scripture can be found in the traditions of the Catholic Church.
First and foremost, there is tremendous confusion concerning the early "lists" of the bishops of Rome, and for good reason. Different sources give different renderings. Why? As simple as it may sound, the reason is easily discovered: no one really cared for the first century of the history of the church at Rome. All the lists come from at the earliest many decades later, and show a concern that did not arise until the Church as a whole began struggling with heresy and began formulating concepts of authority to use against heretics. But in those first decades, even into the middle of the second century, no one was particularly concerned about who the bishop of Rome was. Why? Because no one had the concepts that Rome now presents as "ancient." No one thought the bishop of any one church was above any other, or that the bishop of Rome was somehow invested with any particular authority.
http://aomin.org/1296CATR.html
The Catholic Church makes a lot of
claims that cannot be
proved without appealing to Rome.
Can you prove the Catholic Church existed before Constantine legalized Christianity? Can your prove that early Christians believed the Bishop of Rome was the head of the universal Church? And prove this without appealing to Catholic Church sources or sources that do not use Catholic Church sources? The answer is a resounding NO.