Esaias, I don’t disagree with you, but have not caught up to you on all of your interpretation.
How do you understand this:
Romans 11:15
For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?
Would not your understanding mean that the “receiving of them” as already taken place. If the gentiles and Israel are the same. It seems to me, Paul is making a distinction between Israel and the gentiles.
I think the confusion is that scripture mention Israel as a physical nation of people and also a spiritual kingdom of people, but they are not always one and the same.