What is Messianic Judaism?

Messianic Judaism is not a new movement. In fact, it is the resurgence of a very old movement. Messianic Judaism was the movement of the early followers of Yeshua during the 2nd Temple period and has continued unabated since them. The scriptures inform us that G-d has always preserved a remnant of faith for Himself.
Isa 10:20-21
20 And it shall come to pass in that day that the remnant of Israel, and such as have escaped of the house of Jacob, will never again depend on him who defeated them, but will depend on the LORD, the Holy One of Israel, in truth.
21 The remnant will return, the remnant of Jacob, to the Mighty God.
Rav SHa’ul quotes from Isaiah in Rom 9:27.
Many in the Messianic Jewish movement regard this new upsurge in Messainic Messianic Judaism as the latest stage in the development of an authentic biblical Judaism.  It is the faith followed by Moshe (Moses), David and the Nevi'im (Prophets) and was brought to fulfilment through the coming of Yeshua the Messiah.
Messianic Judiasm Differs From Traditional Judaism
Traditional Judaism teaches that the Tanakh and the Talmud are G-d's Eternal Word.  However they also believe the B'rit Hadashah lacks this authority and that Yeshua is not the Messiah of Israel.
Messianic Judaism teaches that the Tanakh and the B'rit Hadashah together are G-d's Eternal Word, and that the Talmud lacks divine authority. However, we do believe that there are many wonderful insights into the nature and character of G-d and into His purposes with mankind that are revealed in the Oral tradition. We believe that the past sages who have devoted their lives to the study of Torah have grasped essential truths and insights that we would be foolish to ignore.
We also distance ourselves from Jewish mysticism (kabbalah), yet acknowledging that the kabbalistic masters have gained deep and spiritual insights into the mysteries of G-d’s kingdom.