Catholics are considered advanced Christians. Believed and formed by Jesus Christ: the Son of God formed a Christian community with twelve disciples, otherwise called the Apostles. Are you studying religion? This site
Askanydifference helped me to understand this issue. The development of the Christian community, which was formed by the Twelve Apostles, is the Catholic Church. The leader of the church is the successor of the apostles, who is the bishop of Rome, otherwise called the Pope. Jesus Christ appointed St. Peter as head of the Church initially in the first century AD. Thus, the designated Pope is the only successor to Saint Peter.