Christianity in the 1st century in the context of "Christian denominations"

The New Testament (NT) is the second division of the Christian biblical canon. It discusses the teachings and person of Jesus, as well as events relating to first-century Christianity. The New Testament's background, the first division of the Christian Bible, has the name of Old Testament, which is based primarily upon the Hebrew Bible; together they are regarded as Sacred Scripture by Christians.

The New Testament is a collection of 27 Christian texts written in Koine Greek by various authors, forming the second major division of the Christian Bible. It includes four gospels, the Acts of the Apostles, epistles attributed to Paul and other authors, and the Book of Revelation. The New Testament canon developed gradually over the first few centuries of Christianity through a complex process of debate, rejection of heretical texts, and recognition of writings deemed apostolic, culminating in the formalization of the 27-book canon by the late 4th century. It has been widely accepted across Christian traditions since Late Antiquity.

In Christian theology and ecclesiology, the apostles, particularly the Twelve Apostles (also known as the Twelve Disciples or simply the Twelve), were the primary disciples of Jesus according to the New Testament. During the life and ministry of Jesus in the 1st century AD, the apostles were his closest followers and became the primary teachers of the gospel message of Jesus. There is also an Eastern Christian tradition derived from the Gospel of Luke that there were seventy apostles during the time of Jesus' ministry.

The commissioning of the Twelve Apostles during the ministry of Jesus is described in the Synoptic Gospels. After his resurrection, Jesus sent eleven of them (as Judas Iscariot by then had died) by the Great Commission to spread his teachings to all nations.

Patriarchate (/ˈpeɪtriɑːrkɪt, -keɪt/, UK also /ˈpætri-/; Ancient Greek: πατριαρχεῖον, patriarcheîon) is an ecclesiological term in Christianity, referring to the office and jurisdiction of a patriarch.

According to Christian tradition, three patriarchates—Rome, Antioch, and Alexandria—were established by the apostles as apostolic sees in the 1st century. These were officially recognized by the First Council of Nicaea. The Patriarchate of Constantinople was added in the 4th century, and the Patriarchate of Jerusalem followed in the 5th century. These five sees were later recognized collectively as the pentarchy by the Council of Chalcedon in 451.

Christianity in Turkey has a long history, dating back to the early origins of Christianity in Asia Minor and the Middle East during the 1st century AD. In modern times the percentage of Christians in Turkey has declined from 20 to 25% in 1914, to about 2% in 1927, to 0.2–0.4% today. Sources estimate that the Christian population in Turkey ranges between 203,500 and more than 370,000. However, the exact number remains unclear due to the absence of a religious census in the country. The percentage of Christians in Turkey fell mainly as a result of the late Ottoman genocides: the Armenian genocide, Greek genocide, and Assyrian genocide, the population exchange between Greece and Turkey, the emigration of Christians that began in the late 19th century and gained pace in the first quarter of the 20th century, and due to events such as the 1942 Varlık Vergisi tax levied on non-Muslim citizens in Turkey and the 1955 Istanbul pogrom against Greek and Armenian Christians. Exact numbers are difficult to estimate, as many Turkish former Muslim converts to Christianity often hide their Christian faith for fear of familial pressure, religious discrimination, and persecution.

This was due to events which had a significant impact on the country's demographic structure, such as the First World War, the anti-Christian genocides of Greeks, Armenians, and Assyrians perpetrated by Turkish Muslims, and the population exchange between Greece and Turkey, and the emigration of persecuted Christians (such as Assyrians, Greeks, Armenians, etc.) to foreign countries (mostly in Europe and the Americas) that began in the late 19th century and gained pace in the first quarter of the 20th century, especially during World War I. Signed after the First World War, the Treaty of Lausanne explicitly guarantees the security and protection of both Greek and Armenian Orthodox Christian minorities. Their religious institutions are recognized officially by the Republic of Turkey.

Christ, used by Christians as both a name and a title, unambiguously refers to Jesus. As a title it is used both in the reciprocal form "Christ Jesus", meaning "the Messiah Jesus" (or "Jesus the Khristós"; lit. "Jesus the Anointed"), and independently as "the Christ". The earliest texts of the New Testament, the Pauline epistles, often refer to Jesus as "Christ Jesus", or simply "Christ".

The concept of the Christ in Christianity originated from the concept of the messiah in Judaism. Christians believe that Jesus is the messiah foretold in the Hebrew Bible and the Christian Old Testament. Although the conceptions of the messiah in each religion are similar, for the most part they are distinct from one another due to the split of early Christianity and Judaism in the 1st century.

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.