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This post we about the historical Jesus . who was he? Did he or his followers create a new religion? According to historical scholarship [sources: see at the bottom of this post] he practised what corresponds to today’s Orthodox Judaism all his life.
What is Orthodox Judaism, or orthodox Judaism? If it is following the 600+ Laws of Moses in order to be acceptable, it is one thing, but if it is following in the footsteps of Abraham, who was justified by his faith, it is something very different.
In time, following Mosaic Law was said through Jeremiah to be inadequate:
'The Lord says, "The time is coming when I will make a new covenant with the people of Israel and with the people of Judah. It will not be like the old covenant that I made with their ancestors when I took them by the hand and led them out of Egypt. Although I was like a husband to them, they did not keep that covenant. The new covenant that I will make with the people of Israel will be this: I will put my law within them and write it on their hearts. I will be their God, and they will be my people. None of them will have to teach his fellow countryman to know the Lord, because all will know me, from the least to the greatest, because I will forgive their sins and I will no longer remember their wrongs. I, the Lord, have spoken."' Jer 31:31-34
So it seems that there was to be a replacement for Moses, who was a teacher only to show that a return to Abraham's inheritance was necessary. It may be that orthodox Judaism is found by following Jesus, who has forgiven sins, as the Messiah, as indeed the New Testament indicates.