Birth of Christianity

The history of Christianity concerns the Christian religion, Christian countries, and the Christians with their various denominations, from the 1st century to the present.
Christianity originated with the ministry of Jesus, a Jewish teacher and healer who proclaimed the imminent kingdom of God and was crucified c. AD 30–33 in Jerusalem in the Roman province of Judea. His followers believe that, according to the Gospels, he was the Son of God and that he died for the forgiveness of sins and was raised from the dead and exalted by God, and will return soon at the inception of God's kingdom.
The earliest followers of Jesus were apocalyptic Jewish Christians. The inclusion of gentiles in the developing early Christian Church caused a schism between Judaism and Jewish Christianity during the first two centuries of the Christian Era. In 313, Emperor Constantine I issued the Edict of Milan legalizing Christian worship. In 380, with the Edict of Thessalonica put forth under Theodosius I, the Roman Empire officially adopted Trinitarian Christianity as its state religion, and Christianity established itself as a predominantly Roman religion in the state church of the Roman Empire. Christological debates about the human and divine nature of Jesus consumed the Christian Church for two centuries, and seven ecumenical councils were called to resolve these debates. Arianism was condemned at the First Council of Nicea (325), which supported the Trinitarian doctrine as expounded in the Nicene Creed.