Let's go back a step- as far as I could tell you were arguing that God had rejected the original Jews, and was open to adopt "new Jews". If that is not what you meant- then explain.
No, it isn't replacement theology.
For some reason everyone seems to have lost sight of the fact that the Scriptures deal with
two countries; not one. "Jews" encompasses only one of the two.
I will recap:
In the Scriptures, God does not deal with the two countries together. They have separate prophets, separate governments, and separate judgments.
The northern country was divorced by God. The southern was
not.
The northern country was
destroyed. The southern was carried away into captivity - not the same thing.
The northern kingdom literally ceased to exist. The southern kingdom has been a people perpetually for over 3 millennia now. Do you see the difference between the two?
The old prophets say that the northern country will be brought back to life - resurrected. (Ezekiel 37, Hosea 2, etc)
What most people have failed to grasp, is that the New Testament (and Jesus ministry in particular) is not about the Jews, it's about the OTHER country, the northern country.
Matthew 15:24
But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
The Lost House of Israel includes zero Jews. By definition, it is Ephraim and not Judah. In the New Testament, we see Jesus was from the north, and His travels and teachings were primarily in that area, and to the north and east. He went to Perea and Trans-Jordan and Galilee; basically everywhere except Judah. (His trips to Jerusalem were NOT for teaching, but rather they were the mandated pilgrimages for the feasts, which it why it records that He went "in secret.")
Now, keeping in mind that the Lost House is prophesied to be revived, all the New Testament talk of "resurrection" suddenly starts to make sense.
The Lost House is scattered everywhere. Jesus sends messengers (that is what the prophet says will happen), to find them where they are - dead among the goyim - and to revive them.
For that revival to happen, they must be re-adopted. That is what baptism is - an adoption ceremony. It is not just a typical ritual purification.
Do you follow? Shall I continue?