I have dug into this long and hard, because someone told me that by not understanding the OT, I was not knowing what God was about, for all those centuries up to Christ was building for Christ. When I looked into this it sent me to the Hebrew Roots movement, for this is what started the movement.
First, I studied OT with a commentary in hand that said here is how it was told in those days, and then sent me to the NT and said here is how Christ fulfilled it. For instance, as I studied the sacrificial system.
Next I was sent to Hebrews, to read it as the Jew it was written to who considered going back to life without Christ, not as a 2013 who was born again. It told me how Christ changed the world.
My conclusion is that this rather new movement is from God. For about 2,000 years, God has led us to Him, as gentiles, although God wants us all to be one together not Jew and Gentile. Now, there has been changes in our world. The holocaust, the Jews returning to their land, the finding of the dead sea scrolls to open up understanding of ancient Hebrews, all of it is a sign of the change. To back this idea up I dug deep into history, especially the first 500 years of our gentile church to find the steps of how we got where we are in understanding. I read 1,000 years of reports on the councils of our church. It backs up how it seems to me.
What I don't understand is the falling away from God so many of the Jews have done in these last years. History study has shown me that even those who reject Christ has led through their devotion to God. Most Jews who are returning to their land hasn't any understanding that God is sending them there, only the Christians know. I can understand, through the study of Romans, their being blinded to the messiah, but I don't see how this not including even God the Father in their life fits, but God sees.
The world that God tells us about is solidly against this movement, saying these people don't believe in God but in works and lots of other things. I haven't found the list of their "sins" true of them when I look at them closely. The world stands solidly against anything of God. If it is God warning us about them, we should listen. If it is Satan, we shouldn't listen. But I think we should look for truth prayerfully. I have found truth in the movement and I have checked all the world says against them.