In significant respects, it has NOTHING to do with the Israelies.
It has to do with God’s PROMISE to HIS BUDDY, HIS FRIEND, ABRAHAM.
AND
It has to do with setting the world and all creation up for God to DISPLAY HIS GLORY REDEEMING HIS CHOSEN CHARACTERS very dramatically amidst the most dramatic of all times—the END TIMES.
Israelies were always yoyo’s in terms of following God. Thankfully, He declares that He is going to write His law on the hearts of all believers including the Children of Abraham, Isaac and Jacob.
There is a subtle to not so subtle proof in The Sermon on The Mount that God has serious plans yet to be fulfilled for the blood Israelies.
This, in addition to many others . . . amongst them,
the 12 Patriarchs on their thrones in Heaven. That’s far more than ‘merely’ spiritual. They at least speak of tangible authority.
I don’t know specifically WHY God chose a kind of two track relationship with Him. It is clear that Israelies will have to accept Christ. It’s not clear the particular timing of their wholesale Conversion—though it has to occur in the END TIMES.
There is a lot of annecdotal puzzle pieces from here and there that when Christians join together with Jewish folks in doing Biblical good deeds—such as with the poor; or with Messianic Jews such as worship and praise . . . very powerful things can happen.
They’d all be better off in America. It’s the last Christian stronghold.