Pauline Christianity or Pauline theology, otherwise referred to as Gentile Christianity, is the theology and form of Christianity which developed from the beliefs and doctrines espoused by the Hellenistic-Jewish Apostle Paul through his writings and those New Testament writings traditionally attributed to him. Paul's beliefs were rooted in the earliest Jewish Christianity, but they deviated from this Jewish Christianity in their emphasis on inclusion of the Gentiles into God's New Covenant and in his rejection of circumcision as an unnecessary token of upholding the Mosaic Law.

Jewish Christians were the followers of a Jewish religious sect that emerged in Judea during the late Second Temple period. These Jews believed that Jesus was the prophesied Messiah and they continued their adherence to Jewish law. Jewish Christianity is the foundation of Early Christianity, which later developed into Catholic and Eastern Orthodox Christianity. Christianity started with Jewish eschatological expectations, and it developed into the worship of Jesus as the result of his earthly ministry, his crucifixion, and the post-crucifixion experiences of his followers. Modern scholars are engaged in an ongoing debate about the proper designation of Jesus' first followers. Many modern scholars believe that the term Jewish Christians is anachronistic given the fact that there is no consensus about the date of the birth of Christianity. Some modern scholars have suggested that the designations "Jewish believers in Jesus" and "Jewish followers of Jesus" better reflect the original context.