MESSIANIC JUDAISM is Rabbinical Judaism (Pharisee-ism) with a belief in Jesus (Y’shua) as Messiah.
They hold sacred non-Biblical teachings, customs, and traditions, and the Talmud (oral law, writings of the rabbis) as equal to or higher than that of Scripture. The Messiah warned his disciples to stay away from their teachings calling them “Sons of Satan” and that they make disciples of Hell because they do not teach and live the Word of God.

NOTE: Historic Judaism, hundreds of years before the time of the ministry of Jesus (Y’shua), was a more pure observance of Holy Scripture.