Christianity is based upon the teachings of Jesus, a Jew who lived his life in the Roman province of Palestine. Roman communications networks enabled Christianity to spread quickly throughout the Roman empire and eventually to the rest of Europe, and finally the entire globe.

As time progressed, Christianity divided into three major branches. The Roman Catholic branch of Christianity is the successor of the church established in Rome soon after Christ's death. It traces its spiritual history to the early disciples of Jesus. The Pope, or spiritual leader, traces his office's lineage back to St. Peter, the first Pope, one of Jesus' disciples. Roman Catholicism was originally predominately practiced in Ireland, Poland, France and Spain.

The split was primarily a political one due to the division of the Roman Empire into western and eastern components. The two churches became officially separate in 1054. Orthodox churches are largely national, each associated with a particular country. Orthodoxy is common in Russia, Greece, Romania, Bulgaria, the Ukraine, and Armenia.

The Protestant branch split from Roman Catholicism during the Reformation, a sixteenth and seventeenth century series of church reforms in doctrine and practice. This movement challenged the authority of the Pope, and became popular in Scandinavia, England, and the Netherlands. Protestantism eventually divided into many denominations which arose in response to disputes over doctrine, theology, or religious practice. Some of the large denominations today are Lutherans, Methodists and Baptists