The long political and religious evolution of Christianity conducted to the Great Schism from 1054, which divided the United Church. So, now Christianity has two churches: The Orthodox one and the Roman-Catholic one. The Orthodox Church refuses to admit the changes made by Catholics regarding “Credo” and don’t recognize the authority of the Pope and even the Roman Catholic Church itself, in which the Pope has a fundamental role. In 1964, Pope Paul VIth and Patriarch Athenagoras I reestablished the dialogue between these two churches (Orthodox and Roman-Catholic).
At the end of the 15th century, the scholars and the humanists asked themselves about nature and the philosophy and teachings from the Bible, and also about the role of the Church. Many wanted that the Church should be reformed. In Germany, Martin Luther (1483-1546) accused the Church of a series of abuses and made important changes regarding Catholic dogma.
Only in the 20th century, the separated Christians churches started to dialogue with each other, “ecumenism”. The most important event was the Vatican II Synod (1962-1965). Scholars and many believers are trying to find ways to reunite the Church of Christ.