Once again, everyone knows that the Israel of God in the New Testament refers to the church. That is not what the debate is about.Nobody is suggesting that a Gentile is a "son of Jacob", that definition refers to a specific ethnic group. But the "Israel of God" or "the elect of God" or "the Church, Body of Christ", these are all One and the same. There are no Jews or Gentiles in "the Israel of God". We're all One race.
Galatians 6:16 And as many as walk according to this rule, peace and mercy be upon them, and upon the Israel of God.
Gentile believers are part of the spiritual "Israel of God". We have been grafted into the olive tree of God's covenant people (Romans 11), making us part of the true Church, which is seen as the continuation and fulfillment of Israel, rather than a separate entity.
Gentile believers are not a "new" entity but are grafted into the existing olive tree, which represents the covenant people of God.
There is only one covenant of grace spanning the Old and New Testaments. Gentile believers are deemed heirs to the promises made to Israel, having been brought near through the blood of Christ (Ephesians 2:11-22).
The Church has not replaced Israel, but it is the fulfillment of Israel—the true Israel of God, comprised of all believers, regardless of ethnicity.
There is not going to be a future time when ethnic Israelis, repent. Those who die in their sin will go to hell, just the same as everyone else who is outside of Christ. Ethnic Israelis don't have any special privileges or exemptions, they are the same covenant as everyone else.
Yes Acts 1:6-7 confirms that God will restore "spiritual Israel". We will rule the world, with our Lord Jesus.
I don't agree with your Greek interpretation of Acts 1:6-7 because the Lord Jesus did not come to conquer the world by sword or force. He came to establish spiritual Israel.
The debate is about Israel on Earth, not the heavenly Israel.
Genesis 22:17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies;
Believers are as the stars in heaven. The Jews on earth are as the sand upon the sea shore.

