Origins of Christianity in the context of "Ecclesiology"

Jerusalem during the Second Temple period describes the history of the city during the existence there of the Second Temple, from the return to Zion under Cyrus the Great (c. 538 BCE) to the siege and destruction of the city by Titus during the First Jewish–Roman War in 70 CE. During this period, which saw the region and city change hands several times, Jerusalem was the center of religious life for all Jews; even those who lived in the diaspora prayed towards Jerusalem on a daily basis and went there on pilgrimage during three annual religious festivals. Under Hasmonean and Herodian rule, Jerusalem served as a royal capital and the seat of all major national institutions. In Jerusalem, the Pharisees of Second Temple Judaism developed into the Tannaim and Judaism's post-Exilic religious identity as it continues today, and the Hebrew Bible was perhaps canonized, although exactly when this occurred remains disputed. It was also in Jerusalem during the later stages of this period that Christianity was born.

The 600 years of the Second Temple period can be divided into several periods, each with its own distinct political and social characteristics. The physical development of the city was greatly affected by the changing characteristics of each era, while at the same time influencing these periods themselves. The city's population was characterized by social stratification, both economic and religious, which grew more pronounced over the years. There existed in the city, for example, a clear distinction between a rich and cosmopolitan elite and the wider population wishing less influence in the nation's ways from the outside world. Social strata also encompassed different religious outlooks, each with its different emphasis: some reliant on the Temple priests, while the majority were led by traditional non-priestly families, emphasizing the world of Torah study and the development of law over the formal hierarchy established in the Temple.

Christianity, which originated in the Middle East during the 1st century AD, is a significant minority religion within the region, characterized by the diversity of its beliefs and traditions, compared to Christianity in other parts of the Old World. Today, Christians make up approximately 5% of the Middle Eastern population, down from 13-20% in the early 20th century. Cyprus is the only Christian majority country in the Middle East, with Christians forming between 76% and 78% of the country's total population, most of them adhering to Eastern Orthodox Christianity. Lebanon has the second highest proportion of Christians in the Middle East, around 40%, predominantly Maronites. After Lebanon, Egypt has the next largest proportion of Christians (predominantly Copts), at around 10% of its total population. Copts of Egypt, numbering around 10 million, constitute the single largest Christian community in the entire Middle East.

The Eastern Aramaic speaking Assyrians of northern Iraq, northeastern Syria, southeastern Turkey, and parts of Iran have suffered due to ethnic cleansing, religious discrimination, and persecution for many centuries. During the 20th century, the percentage of Christians in the Middle East fell mainly as a result of the late Ottoman genocides: the Armenian genocide, Greek genocide, and Assyrian genocide committed against them by the Ottoman Turks and their allies, leading many to flee and congregate in areas in northern Iraq, northeastern Syria, North America, and Western Europe. The great majority of Aramaic speaking Christians are followers of the Assyrian Church of the East, Chaldean Catholic Church, Syriac Orthodox Church, Ancient Church of the East, Assyrian Pentecostal Church and Assyrian Evangelical Church. In Iraq, the numbers of Christians has declined to between 300,000 and 500,000 (from 0.8 to 1.4 million before 2003 US invasion). Assyrian Christians were between 800,000 and 1.2 million before 2003. In 2014, the population of the Nineveh Plains in northern Iraq was scattered to Dohuk, Erbil and Jordan due to ISIS forcing the Assyrian community out of their historical homeland, but since the defeat of the Islamic State in 2017, Christians have slowly began returning.

Joseph Ernest Renan (/rəˈnɑːn/; French: [ʒozɛf ɛʁnɛst ʁənɑ̃]; 27 February 1823 – 2 October 1892) was a French Orientalist and Semitic scholar, writing on Semitic languages and civilizations, historian of religion, philologist, philosopher, biblical scholar, and critic. He wrote works on the origins of early Christianity, and espoused popular political theories especially concerning nationalism, national identity, and the superiority of White people over other human races. Renan is among the first scholars to advance the debunked Khazar theory, which held that Ashkenazi Jews were descendants of the Khazars, Turkic peoples who had adopted the Jewish religion and allegedly migrated to central and eastern Europe following the collapse of their khanate. On this basis he alleged that the Jews were "an incomplete race."

The Christ myth theory, also known as the Jesus myth theory, Jesus mythicism, or the Jesus ahistoricity theory, is the fringe view that the story of Jesus is a work of mythology with no historical substance. Alternatively, in terms given by Bart Ehrman paraphrasing Earl Doherty, it is the view that "the historical Jesus did not exist. Or if he did, he had virtually nothing to do with the founding of Christianity."

The mainstream scholarly consensus, developed in the three quests for the historical Jesus, holds that there was a historical Jesus of Nazareth who lived in first-century AD Roman Judea, but his baptism and crucifixion are the only facts of his life about which a broad consensus exists. Beyond that, mainstream scholars have no consensus about the historicity of other major aspects of the gospel stories, nor the extent to which they and the Pauline epistles may have replaced the historical Jesus with a supernatural Christ of faith.

The Mosaic covenant or Law of Moses, which Christians generally call the "Old Covenant" (in contrast to the New Covenant), played an important role in the origins of Christianity and has occasioned serious dispute and controversy since the beginnings of Christianity: note for example Jesus' teaching of the Law during his Sermon on the Mount and the circumcision controversy in early Christianity.

Rabbinic Jews assert that Moses presented the Jewish religious laws to the Jewish people and that those laws do not apply to Gentiles (including Christians), with the exception of the Seven Laws of Noah, which (according to Rabbinic teachings) apply to all people.