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Bravo...it's rare to see a protestant (I assume you're protestant) recognizing that the tree is Israel. I would go even further....if gentiles don't realize and affirm they are of Israel then they have no part in the new covenant because the new covenant is made ONLY with the house of Israel and the house of Judah:

Heb 8:7 For if that first covenant had been faultless, then no place would have been sought for a second.
Heb 8:8 Because finding fault with them, He says: "BEHOLD, THE DAYS ARE COMING, SAYS THE LORD, WHEN I WILL MAKE A NEW COVENANT WITH THE HOUSE OF ISRAEL AND WITH THE HOUSE OF JUDAH—
Heb 8:9 NOT ACCORDING TO THE COVENANT THAT I MADE WITH THEIR FATHERS IN THE DAY WHEN I TOOK THEM BY THE HAND TO LEAD THEM OUT OF THE LAND OF EGYPT; BECAUSE THEY DID NOT CONTINUE IN MY COVENANT, AND I DISREGARDED THEM, SAYS THE LORD.
Heb 8:10 FOR THIS IS THE COVENANT THAT I WILL MAKE WITH THE HOUSE OF ISRAEL AFTER THOSE DAYS, SAYS THE LORD: I WILL PUT MY LAWS IN THEIR MIND AND WRITE THEM ON THEIR HEARTS; AND I WILL BE THEIR GOD, AND THEY SHALL BE MY PEOPLE.

Those who claim that Christianity is and should be a gentile church are not, as you point out, recognizing that they have been grafted into the tree of Israel only through the grace of God and the shed blood of Christ.