Summarized

The provided text, a transcript of a YouTube video titled "A History of Christian Schism," explores the historical divisions within Christianity. The speaker begins by defining "schism" as a division within a religion, highlighting the diverse nature of Christian denominations, particularly within the Canadian Council of Churches, which includes 26 member churches from various Protestant, Anglican, Catholic, and Orthodox traditions. Notably, evangelical and Pentecostal churches are not part of this council in Canada, unlike their significant presence and influence in the US.

Globally, Christians number about 2.5 billion, with roughly half in communion with the Roman Catholic Church. The next largest group is Protestants and Anglicans (around 885 million), followed by Eastern Orthodoxy (225-300 million), Oriental Orthodoxy and Churches of the East (86 million), and smaller groups like Restoration and non-Trinitarian churches (42-48 million).

The lecture then delves into the historical origins of these divisions, starting with the biblical passage in Matthew where Jesus gives Peter the "keys to the kingdom." While Catholics interpret this as the basis for papal primacy, the speaker argues it's an anachronism reflecting the Matthew community's efforts to establish authority in the 80s CE, as Peter wasn't demonstrably connected with Rome in early sources. The speaker emphasizes that the gospels are "scripture portraits" rather than historical biographies, written by later Christians who believed in the Risen Christ, often drawing more from the Hebrew Bible than direct historical memory.

Early Christianity was not a monolithic entity but comprised multiple communities with conflicting ideas. The speaker contrasts the Pauline and Jamesian (or Jacoban) strands of Christianity, particularly regarding adherence to Jewish law, with Paul advocating for Gentile converts not needing to follow it, in contrast to James's Jerusalem-based group. These rival communities often asserted their authority by claiming direct ties to specific apostles.

The text then discusses several early Christian groups deemed "heresies" by the Proto-Orthodox church (which ultimately became the Catholic and Orthodox Church). These include the Ebionites (who insisted on following Jewish law and may have influenced early Islam) and the Gnostics (who believed in secret wisdom and a flawed creator God). The Proto-Orthodox tradition prevailed, becoming state religions in the 4th century in the Roman Empire, Armenia, and Axum (Ethiopia).

Further divisions arose from theological debates, especially concerning the nature of Christ. The speaker explains the challenges of reconciling monotheism with the Trinity. Early attempts like Adoptionism (Jesus as a righteous man adopted by God) and Docetism (Christ only appearing human) were rejected by Proto-Orthodoxy. Modalism (Father, Son, and Holy Spirit as aspects of one God) and Partialism (as parts of one God) were also deemed heretical. The accepted Trinitarian doctrine became a paradox: one God, but three distinct persons.

A significant schism occurred with Arianism in the 4th century, which held that Christ was a divine creation but not co-eternal with God. Although initially condemned, Arianism spread among Germanic tribes, leading to a schism when these tribes formed kingdoms in the fallen Western Roman Empire. This was largely eradicated by the 6th century.

Later christological debates centered on whether Christ had two natures (human and divine) in a single hypostatic union (Dyophysitism) or a single unified divine-human nature (Miaphysitism). Nestorianism, an attempt at compromise, was also condemned. These theological differences led to the separation of the Church of the East (Nestorian, thriving in the Persian Empire and extending to China and India) and the Oriental Orthodox Churches (Miaphysite, including the Syriac Orthodox and Coptic Orthodox Churches, which found reprieve under Muslim rule in Syria and Egypt, and the Ethiopian Orthodox Church).

The "Great Schism" between the Greek East and Latin West in 1054 CE was primarily driven by political and traditional differences, particularly over papal supremacy, the filioque clause in the Nicene Creed (Holy Spirit proceeding from Father and Son), and liturgical practices. Despite attempts at reconciliation, the division solidified, especially after the fall of Constantinople in 1453. Eastern Orthodoxy is characterized by its autocephalous (self-headed) national churches, recognizing the Ecumenical Patriarch of Constantinople as "first among equals."

Finally, the text discusses the Protestant Reformation, which began in the 16th century with the intent to reform the Latin Church but resulted in a break from Rome. Protestants rejected traditional sources of authority like Apostolic Succession, Church Fathers, and inherited tradition, asserting the Bible as the sole source of authority. This, however, led to diverse interpretations and the emergence of tens of thousands of distinct Protestant denominations (Lutherans, Baptists, Calvinists, Anglicans, Methodists, Evangelicals, Pentecostals, etc.). The speaker also highlights the modern Evangelical divide, marked by a literalistic reading of the Bible and a rejection of modern biblical scholarship. Restorationist groups like Jehovah's Witnesses and Mormons represent further diversions from traditional Christian understandings, often rejecting Trinitarianism.