Bob Hill; After Israel had been shown that they had been set aside, Paul was inspired by God to write about the unity of the Spirit in Ephesians 4:4,5 “There is one body and one Spirit, just as you were called in one hope of your calling; one Lord, one faith, one baptism.”
The One Faith was
once delivered to the Saints, and Jude exhorts us to earnestly contend for the Faith once delivered,
meaning it was final, finished, and nothing to be added unto.
Gentile Believers are joined to Israel by being adopted into the One Living Spirit who is come in the created new "Israel" flesh of the second human being name.
"Salvation is of the Jews", and Gentiles who come into the name of the New Man receive the spiritual promises that belong naturally to Israel of Jacob, to whom pertains the Adoption, and Believing Gentiles are debtors to natural Israel.
God has a remnant reserved to Himself of the natural branches in His New Man name, which Name all redeemed Gentiles are grafted into and can also be cut off from by unbelief.
Gentiles are debtors to the Jews and Salvation is of the Jews. Some did not believe, but the promises are irrevocable and the spiritual heritage which is irrevocable which is promised to Israel, the Believing Gentiles also share with them.
Israel is formed to establish the heavens, says the Word, and the tabernacle in the wilderness is a type and shadow of that establishment which is to come in the New Man Name, and the Name is "Israel".
Jesus Christ is Israel, God's only begotten Son as to the human kind, the New Man of the second creation who is the Kinsman to Adam of the first human creation.
Adam is one "man" as to being, and Israel is one Man, as to being; we are born in Adam but to be sons of God we must be adopted into Israel by the Spirit of adoption regenerating our being, which is the second birth and is from above.
Christ is the Living Spirit who is come in that second human being flesh, and "Jesus" is "Salvation" in the Hebrew, as "Oshea", "Hoshea", and Isaiah" also are interpreted as.
He is called "Salvation" by we who know Him as His adopted people, but the Father called Him "Israel", and He makes much of Jacob's seed being His namesake, called by His Name.
MAD doctrine is a form of anti-Israel sectarianism which has cut itself off from the Name of the only begotten Son of God by denying His Jewish roots, missing the reason He formed Israel for His glory.
Rom 15:26, 27 For it hath pleased them of Macedonia and Achaia to make a certain contribution for the poor saints which are at Jerusalem.
It hath pleased them verily;
and their debtors they are. For if the Gentiles have been made partakers of their spiritual things, their duty is also to minister unto them in carnal things.
Israel -Jesus Christ, God the Word, the Hidden God- speaks:
Isa 49:1 Listen, O isles, unto me; and hearken, ye people, from far; The LORD hath
called [named] me from the womb; from the bowels of my mother hath he made mention of my name.
Isa 49:2 And he hath made my mouth like a sharp sword;
in the shadow of his hand hath he hid me, and made me a polished shaft; in his quiver hath he hid me;
Isa 49:3 And said unto me, Thou [art] my servant, O Israel, in whom I will be glorified.
Isa 49:5 And now, saith the LORD that formed me from the womb [to be] his servant, to bring Jacob again to him, Though Israel be not gathered, yet shall I be glorious in the eyes of the LORD, and my God shall be my strength.
Isa 49:6
And he said, It is a light thing that thou shouldest be my servant to raise up the tribes of Jacob, and to restore the preserved of Israel: I will also give thee for a light to the Gentiles, that thou mayest be my salvation unto the end of the earth.