Early Christianity developed out of the ministry of Jesus. After His death, his earliest followers formed a Jewish sect during the late Second Temple period of the 1st century. According to Paul the Apostle, Gentile converts could be allowed exemption from most Jewish commandments, arguing that all are justified by faith in Jesus. This was part of a gradual split of early Christianity and Judaism, as Christianity became a distinct religion including predominantly Gentile adherence. Jerusalem had an early Christian community, which was led by James the Just, Peter, and John. Antioch was where the followers were first called Christians. The apostles went on to spread the message of the Gospel.

- Source: https://en.wikipedia.org/wiki/Christianity_in_the_1st_century