Romans 11

http://www.esvbible.org/Romans+11/

God has not rejected the Jewish people. He does not reject anyone. Just think of it like this: there are Jewish people who come to know Christ. Paul and all of the other Apostles were Jewish. Israel, and Jewish people by extension, have never fully achieved what they have striven for. Only those on which God has bestowed His kindness can achieve salvation. And you don't get God's kindness by anything you do because if you did, it wouldn't be kindness. The fall of Jewish people made the world rich because it helped open salvation to the non-Jewish. If the Jewish people return to Jesus, the world will be richer. If God is the root of an olive tree, then the branches are holy by extension. For a while, the branches were Israel, but God cut those off who did not believe and grafted the gentiles on who do believe. He can just as easily cur anyone off who does not continue to believe. If Jewish people start to believe, they can easily be grafted back onto the tree. We cannot become arrogant in being one that has received God's approval because the branches of the olive tree did not graft themselves onto the tree. The make had to do it for them. After all, who knows how God thinks? Who has anything to offer Him that He doesn't already have? Who can give Him something that He will have to pay back? God uses us because He loves us, not because He needs us.