He hasn't really. Not all Christians are Catholic.
Pope Saint Celestine I consecrated Maewyn Succat as a bishop, changed his name to Patricius (Patrick) and sent him to Ireland as a missionary.
The Pope (Currently Pope Francis)
Pope.
Pope Celestine
Pope Gregory the Great
Pope Francis was elected as pope in March of 2013.
Catholic
Several sects of the Christian church, but not all Christians, acknowledge a "Pop":Catholic Church - PopeEastern Orthodox Churches - Pope and Patriarch of AlexandriaOriental Orthodox Churches - Pope of Alexandria
Presbyterians, while they may respect the pope, do not acknowledge him as the spiritual head of Christianity.
The Pope has called Judaism "Christianity's older sister," since Christianity bases much of its content on Judaism.
the church changed when Pope John Paul died and Pope Benedict took over. And that's all i know ! :)
The pastor. ---- The Pope, With most of the Christians in the world being Roman Catholics, The Roman Catholic Church is the face of Christianity to the non-Christian world, as such, the Pope is the most major religious leader in Christianity.