John 8:38-47.......see the beginnings of the new understanding of who "Israel" is.
Romans 4:16:
Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham’s offspring—not only to those who are of the law but also to those who have the faith of Abraham. He is the father of us all.
Colosians 3:11
Here there is no Gentile or Jew, circumcised or uncircumcised, barbarian, Scythian, slave or free, but Christ is all, and is in all.
Galations 6:16:
Peace and mercy to all who follow this rule—to[a] the Israel of God.
....remember here, Paul is an apostle to the Gentiles.
There's more, but please comment on this so far.
It is not saying that Israel is spiritual now, for not all Israel is Israel. Rather, the elect are of Israel. Israel is a nation, and there is the Israelite indeed. If you observe God's commandments, and accept God's Word, even His Messiah, you are of Israel. It is important to study God's Law, or Torah. There are 613 commands, commandments, laws, mitzvot, for us to observe. Have you turned to God from among the Gentiles? Then are you of Israel? You have four essentials to observe, as specified in Acts 15. Do you know about the commonwealth of Israel? Do you know about the middle wall of partition that has been done away with? Do you know that the enmity, the law of commandments contained in ordinances, has been abolished?
Shalom.
Jacob