God has certainly not rejected all Jews. I am evidence of that. Just like in the past, there is also at the present time a small group of us Jews who have become believers.

Romans 11:1-6

11 Because of that, if anyone should ask, “Has God rejected his people the Jews?” I would declare that he certainly has not rejected all of us! You can realize that by remembering that I also belong to the people of Israel. I am a descendant of Abraham, and I belong to the tribe of Benjamin, but God has not rejected me! 2 No, God has not rejected his people, whom he chose long ago to be people whom he would bless in a special way. Remember [RHQ] what is written [PRS] in the Scriptures about Elijah when he mistakenly complained to God about the people of Israel, saying, 3 “Lord, they have killed the rest of your (sg) prophets, they have destroyed your altars. I am the only one who believes in you who remains alive, and now they are trying to kill me!” 4 God answered him like this: “You(sg) are not the only one who believes in me! I have protected for myself not just you, but 7,000 other men who have not worshipped the false god Baal. ◄Remember that!/Do you not remember that?► [RHQ]” 5 So, similarly, there is also at this time a small group of us Jews who have become believers. God has chosen us to become believers (OR, his people) only because he acts kindly toward us, in ways that we do not deserve. 6 Since it is because he acts kindly toward those whom he chooses, it is not because they have done good things that he has chosen them. If God chose people because they did good deeds, then it would not be because he was acting toward them in a way that they did not deserve.