Jesus kinda attacked the orthodoxy of his day too didn't he?
Jesus actually defended the traditional Judaism of his day against the excesses of two groups: the Pharisees and the Sadducees.
Some Jewish commentators on Jesus - like Geza Vermes - have characterized Jesus as defending a rural, traditional Jewish belief typical of the Galilean common people against the overly refined hairsplitting of the hypereducated Pharisees and the Levitical elitism of the Sadducees.
jesus certainly affirmed all the touchstones of Jewish orthodoxy - a reverence for Torah law, a compliance with Torah feastkeeping and traditional Jewish liturgy centered on the Temple in Jerusalem, a belief in the Messiah and the teachings of the traditional prophets like isaiah and Jeremiah, etc.