Just the unbelieving Israelites were cut off.
Then the believing Gentiles were grafted on.
Unbelieving Israel (the natural branch) was cut off (of Jesus).
Then the Gentiles (the wild branch) was grafted on (to Jesus).
Jesus is the Israel the Gentiles were grafted onto.
No.
Jesus is not Israel, neither unbelieving Israel, nor the Remnant that did believe, not in this context.
You can't have your cake and eat it too, here.
Yes, yes, I know the relationship between Matthew 2 and Hosea 11. But this is this, and that is that.
Mashing things together doesn't help anyone.
Everything in its proper context.
In the context of Jesus and his family coming out of Egypt, Israel (the nation) was a type of Christ, in that Jesus coming out of Egypt was foreshadowed by Israel coming out of Egypt.
But in the context of the cutting off of Israel in Romans 11, that typology doesn't apply here, and you err by trying to apply it here.
In this context, Jesus is the trunk of the natural olive tree, and gentiles come from a wild olive tree.
Israel is the branch on the natural tree.
The unbelieving portion of Israel was cut off, and left a remnant of believers, like when you cut a branch off a tree, it leaves a remnant.
The gentile believers were grafted onto the root of Jesus, not onto the remnant (verse 17: "grafted in among them").
Did you catch that?
The gentiles "were grafted in among them," the "them" being..... You guessed it! ... Israel!
Which means the Gentiles weren't grafted onto Israel. They were grafted in AMONG Israel, ONTO CHRIST!
Which, necessarily means that, in this context, Jesus is not Israel, and Israel is not Jesus.