Not at all. One split with long lasting consequences that preceded the East-West Scism that I can think of was after the Council of Chalcedon in 451 A.D., where Council agreed in a two nature definition of Christ, while a minority of the Church disagreed. The successors to those who disagreed became Oriental Orthodox churches, such as the Armenian Apostolic Church.

You can find earlier divisions in Christianity as well, such as the adoptionists who believed that Jesus Christ was the adopted son of God. A good term is proto-Orthodox Christianity, which means those traditions of Christianity that would eventually become orthodox (not "orthodox" as in "the Orthodox Church" but "orthodox" as in "the correct views"), but which had numerous different rivals, including groups like Arians (who did not believe that Jesus was God), Adoptionists, Jewish Christians, etc.

Source for the Adoptionists, Arianism, etc. is Bart D. Ehrman's The New Testament: A Historical Introduction to the Early Christian Writings

Follow up question:Catholicism is so both the richest and well known of the Christian sects. But how did it get that way? Where did the money come from? Is it simply a question of geography and historical fate?