The honest truth? Because Evangelicals have no culture, history or any tradition at all to give credit or assurance to their doctrines and beliefs. As much as they may deny the importance of it, the truth is that deep down they really do desire it. And they are desperate for it. HOWEVER, they HAATE the Roman Catholic (and Orthodox if they knew who we were) Church and are xenophobic of anything having to do with the Church because they have been indoctrinated all their lives into believing that the RC (once again, EO if they knew who we were) Church is the evil spawn of Satan that corrupted the truth right after the Apostles died. So what do they do? Instead of looking to the Church, Fathers and early Christian writers, they instead consult Jews and Rabbis and try to basically recreate Judaism, because for some reason, in their mind, it somehow gives their beliefs more credibility because many of them still believe (due to Zionism) that the Jews have a Covenant with God. This personally is why I believe that so many Protestants are more willing to consult Jewish Rabbis and Judaism than they are the Church.