Jesus, if anything, was a good Jew and should be interpreted in light of Jewish traditions. Though he may have opposed certain Jewish sects, which were many, he was clearly in the line of the Old Testament. Christianity was a misinterpretation of Judaism that  occurred after the Romans destroyed the Jewish State and killed its leaders, including the early Christians and their leaders like James, called the brother of Jesus. It took several centuries for Jewish Christianity to evolve into Roman  Christianity and we can document this historically with the aid of various historical records. Paul was pivotal in turning this Jewish sect into a Roman religion. He was the real founder of the Christian religion not Jesus or his disciples who remained faithful Jews.

Roman Christianity was the invention of a later age when the Jewish Christians, defeated and scattered by the Romans, reorganized and intermingled with the general Roman public. In order  to gain support in Roman society they downplayed and then denied their Jewish background.