How christianity started
The history of the Christian religion and the Christian church began with Jesus and his apostles. Christianity is the religion that is based on the birth, life, death, resurrection and teaching of Jesus Christ.
Christianity began in the 1st century AD after Jesus died as a Jewish sect in Judea but quickly spread throughout the Roman empire. Despite early persecution of Christians, it later became the state religion. In the Middle Ages it spread into Northern Europe and Russia. During the Age of Exploration, Christianity expanded throughout the world; it is currently the largest religion of the world.
Most of the first Christians were ethnically Jewish or Jewish proselytes. An early difficulty came from non-Jewish converts. There was the question if they had to “become Jewish” before becoming Christian. The decision of St. Peter, was that they did not, and the matter was further addressed with the Council of Jerusalem.
The doctrines of the apostles brought the Early Church into conflict with some Jewish religious authorities, and this eventually led to the martyrdom of SS. Stephen and James the Great and expulsion from the synagogues. Thus, Christianity got an identity distinct from Judaism. The name “Christian” (Greek Χριστιανός) was first used for the disciples in Antioch, as recorded in (Acts 11:26; Acts 11:26)