You are just one of many believers that have failed to understand the Old Testament Books of God's Word involving The Gospel of Jesus Christ. The Promise by Faith God first gave to Abraham is about The Gospel of Jesus Christ. That Gospel was ordained before the foundation of this world, as Apostle Paul and Peter also explained in Ephesians and 1 Peter 1. The fact that the Promise was first given to Abraham, and then was continued through a specific lineage, with Isaac, then Jacob, then Joseph, and finally with Joseph's two sons Ephraim and Manasseh, is not only about God's blessings to them, but it includes The Gospel of Jesus Christ. Israel is the name for the 'overcomers' in Christ Jesus, not just a nation in the flesh. Does it involve flesh seed? Yes, that specific lineage that God elected among the children of Israel, which Apostle Paul also covered in Romans 11, while the rest, or even majority of the seed of Israel were blinded. The whole matter is about God's Birthright to 'HIS' firstborn...
Jer 31:9-10
9 They shall come with weeping, and with supplications will I lead them: I will cause them to walk by the rivers of waters in a straight way, wherein they shall not stumble: for I am a father to Israel, and Ephraim is My firstborn.
10 Hear the word of the LORD, O ye nations, and declare it in the isles afar off, and say, He that scattered Israel will gather him, and keep him, as a shepherd doth his flock.
KJV
God is going to gather the 'believing' seed of Israel, but those just so happen to make up part of His Church today, the rest are believing Gentiles joined with them. Both will be gathered together by Christ at His coming.
Future:
Isa 19:23-25
23 In that day shall there be a highway out of Egypt to Assyria, and the Assyrian shall come into Egypt, and the Egyptian into Assyria, and the Egyptians shall serve with the Assyrians.
24 In that day shall Israel be the third with Egypt and with Assyria, even a blessing in the midst of the land:
25 Whom the LORD of hosts shall bless, saying, "Blessed be Egypt My people, and Assyria the work of My hands, and Israel Mine inheritance."
KJV
As written there, Assyria and Egypt will each be one third with Israel in God's future Kingdom in the holy lands. There will be a highway literally stretching from Egypt thru Israel and into Assyria joining them. All the strife between God's elect and the nations will no longer exist in that future time.
Thus the divisions happening today are simply being used by greedy dishonest men to suck money out of the gullible who listen to them, instead of listening to our Heavenly Father and His Son in His Word. Israel is the name for those in God's Birthright Promises first given to Abraham, and that means those who believe on Jesus Christ The Gospel. This is why Apostle Paul said in Galatians there is no difference between Jew and Gentile in Christ Jesus. Thus it is about spiritual recognition for those who believe The Gospel, regardless of birth. That's God's true Israel under Christ Jesus.