Read Romans Chapter 11
“I ask, then, has God rejected his own people, the nation of Israel? Of course not! I myself am an Israelite, a descendant of Abraham and a member of the tribe of Benjamin. No, God has not rejected his own people, whom he chose from the very beginning.
Romans 11:1-2 NLT
Chapter 11 discusses Israel and the Gentiles.
So here is a little history. God established a covenant with a man named Abraham. God told him that his offspring would be great and innumerable and that the whole world would be blessed through his seed.
Abraham had a son named Isaac, and Isaac had a son named Jacob. God changed Jacob's name to Israel. Jacob, now named Israel, had 12 sons. Israel would become a nation of 12 tribes. Paul identifies himself with the tribe of Benjamin. So why are they called “chosen“? Because God chose to bring the savior of the world through the nation of Israel, and specifically through the tribe of Judah. Jesus was a Jew. The word “Jew” originated with the ancient Israelite kingdom of Judah.
Now the word “Gentile” means “non-Jewish” or the nations at large. So most of us are by definition Gentiles, but the covenant that God made with Abraham included a promise that the whole world would be blessed! Jesus Christ was the promised Messiah, not only for the Jews but for the whole world!
Jesus was rejected as being the Messiah by the nation of Israel when he came, however many individual Jews did receive Him and still do. God is not through with Israel. There are still promises pertaining to their nation and someday they will come to recognize Jesus as their Messiah.
Chapter 11, Paul who primarily preached to the Gentiles tells us that we were grafted in. Romans 8:15 says “So you have not received a spirit that makes you fearful slaves. Instead, you received God’s Spirit when he adopted you as his own children. Now we call him, “Abba, Father.” So folks, at the end of the day it won’t matter if you are Jew or Gentile. What will matter is if you are a child of God, and that only happens when you believe on the Lord Jesus Christ as your savior!