And what can change the nature of a people? It would take something deeper than simple belief. It would take faith, I think.

If you read the Bible, the jewish people are fated to stray over and over again. And to be punished. There can be no salvation from this cycle apart from Christ. I don't know what God has in store for the jews, but I can tell you if they converted and broke that cycle, they'd not be jews any more but Christians. For the followers of Christ, I think evil nature, the DNA or whatever, can be overcome. The spirit of God would not be great if it could not overcome our nature from time to time.