In a nutshell ,the Greek churches were led from Constantinople,the seat of the newer Eastern Roman Empire and the western chuches from Rome. In time their cultures
diverged more and more in language, ritual and theological nuance. There is a long
wearisome history of various insults and political rivalry,ecclesiatical and not as well
as doctrinal and scriptural dispute.
This has often grieved thinkers on both sides mindful of the shared tradition.
As late as 1439 in Council in Florence the churches reunited only to resplit shorly
afterward.
The state of aggrieved separation persists.
Starting with Francis of Assi in the early 12th century, some priests and monks began questioning some of the practices of the RC Church. Girolamo Savonarola in the 1400s really brought some unchristian practices and abuses of power into the light. The actual split came when Luther (a Roman Priest) nailed he 95 theses to the wall of the church (this along with the translation of the scriptures into the vernacular tongues caused a firestorm of questioning and debate and a lot of anathemes)
Christianity can be divided into three parts: the Roman Catholic Church, the Eastern Orthodox Church, and Protestantism. The Roman Catholic Church and Eastern Orthodox Church split in the 11th Century. Protestantism was born from Reformation in the 16th Century and split from the Roman Catholic Church at that time.
There is an Orthodox Church and a Catholic Church. There is no Catholic Orthodox Church.
The Catholic Church and the Orthodox Church
Oh no they are quiet diffrent, catholics have made Mary a god. Christians of the Catholic Church, the Eastern Orthodox Church, Oriental Orthodox Church, Anglican Communion, and Lutheran churches believe that Mary, as mother of Jesus, is the Mother of God
The Byzantine Empire's dates run from  A.D. 330 – 1453. Until the Eastern Orthodox Churches split from the Catholic Church in A.D. 1054 there were no "branches" of Christianity, there was only the Catholic Church.
The Church of Christ was founded by the Holy Apostles on the First Pentecost. That Church was Orthodox (Right believing, Right worshipping) and Catholic (Universal). The Church of Christ-wherever people were converted to it, was Orthodox, until 1054, when the West (Western Europe) split from the Orthodox Church due to different issues, but mainly revolving around the novel claim of the Popes that they had more power than did all the other Bishops of the Church. As time went on, the church in the West became known as "the Roman Catholic Church," the True Church of Christ in the East as the "Orthodox Church," usually modified by the region of the Church being spoken of - "Greek Orthodox Church," "Russian Orthodox Church," etc. In light of the belief of the Orthodox Church that it is the True Church of Christ, and therefore, True Christianity, "Christianity" did not "become Orthodox or Catholic," but always was, and still is Orthodox; Roman Catholics are an organization that adopted incorrect beliefs about the Church and about Christ from the 9th century on; once being identical, by the 20th century, the gulf had widened greatly, with Roman Catholic belief becoming very far away, indeed, from the beliefs of Orthodox Christianitythe True Church of Christ, the only Genuine Christianity.
There were two main churches: Roman Catholic and Orthodox. - UPDATE - Actually there were three main churches at the time, the Roman Catholic Church, Eastern Orthodox Church and Oriental Orthodox Church. The Oriental Orthodox Church was the first church to break away from the Orthodox Church (Eastern Orthodox Church) in 451AD followed by the Roman Catholic Church in 1054AD.
The East-West Schism - APEX
Orthodox-Catholic Church of America was created in 1892.
Christianity was split between the roman catholic church and the eastern orthodox church
the Eastern Orthodox Church and the Roman Catholic Church
4 Roman Catholic