The Judaism practiced in Israel today has little or no similarity to the Judaism of the Old Testament (the Tanakh). Rabbinical Judaism of today is based on the Oral Torah, which is not in the Old Testament. This Oral Torah is from the Talmud, which consists of the Mishnah and its commentary the Gemarah. The written Torah was the one given to Moses by God on Mt. Sinai. This written Torah comprises the first five books of the Bible: Genesis; Exodus; Leviticus; Numbers; and, Deuteronomy.
Today’s Rabbis claim that the Oral Torah was also received from God by Moses, but was passed down from generation to generation by word of mouth, unlike the written Torah. The Oral Torah was finally put into writing somewhere around 200 B.C.
There is absolutely no proof in the written Torah that speaks of an Oral Torah. And most Messianic Jews (Jews who believe in Yeshua, or Jesus) also agree that nothing in the Oral Torah has any similarity to what is taught in the actual Old Testament.
If this subject is of interest to you, I highly recommend watching the Youtube video with the link below. In it, Dr Eitan Bar, a Messianic Jew has a debate with Rabbi Chaim Sheitrit on the subject of the Oral Torah. It was debated quite well by Dr. Bar. The material presented clearly shows that the Oral Torah did not come from God through Moses, and that just about all of what is practiced in Judaism today has little or nothing to do with the Bible, especially first five Books of Moses—the Torah.
The video is in Hebrew with English captions. I highly recommend watching this 1 hours 28 minute video until the end. Dr. Bar is quite impressive and has tremendous support from other Messianic organizations in Israel.
If you want to know what God is doing with Messianic believers in Israel and around the world, I recommend visiting ONE FOR ISRAEL Ministry’s website. As a Christian you have to realize that you have been grafted into the body of Messiah. While, in Christ, there is no Jew or Gentile, the foundation for all that Christians believe is based on the promises God gave to the Jews. So if you want to know more about Jesus, you have to know more about the Jews, especially Messianic Jews in Israel.
For if you were cut off from the wild olive tree, and were grafted into a good olive tree, contrary to nature, how much more shall these, the natural branches, be grafted back into their own olive tree? —Romans 11:24