I guess I would discuss these topics & verses for a start:
God's Israel - The New Creation:
NET Galatians 6:14-18 But may I never boast except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world. 15 For neither circumcision nor uncircumcision counts for anything; the only thing that matters is a new creation! 16 And all who will behave in accordance with this rule, peace and mercy be on them, and on the Israel of God. 17 From now on let no one cause me trouble, for I bear the marks of Jesus on my body. 18 The grace of our Lord Jesus Christ be with your spirit, brothers and sisters. Amen.
God's Israel:
Some language details from the NET Bible notes so it's not from me, although I would have said something very similar (My highlights):
NET Notes (Gal 6:16)
29 tn The same Greek verb, στοιχέω (stoicheo), occurs in Gal 5:25.
30 tn The word "
and" (καί)
can be interpreted in two ways: (1) It could be rendered as "also" which would indicate that two distinct groups are in view, namely "all who will behave in accordance with this rule" and "the Israel of God."
Or (2) it could be rendered "even," which would indicate that "all who behave in accordance with this rule" are "the Israel of God." In other words, in this latter view, "even" = "that is."
The NIV picks this up:
NIV Galatians 6:16 Peace and mercy to all who follow this rule-- to the Israel of God.
The New Creation:
NET 2 Corinthians 5:17 So then, if anyone is in Christ, he is a new creation; what is old has passed away– look, what is new has come!
Who is a Jew:
NKJ Romans 2:26-29 Therefore, if an uncircumcised man keeps the righteous requirements of the law, will not his uncircumcision be counted as circumcision? 27 And will not the physically uncircumcised, if he fulfills the law, judge you who, even with your written code and circumcision, are a transgressor of the law? 28 For
he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; 29 but
he is a Jew who is one inwardly; and circumcision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God.
Note the play on words:
Jew - whose
praise is from God
The name Jew: Summary
Meaning
Praiser
Etymology
From the verb ידה (
yada), to praise.
Related names
• Via ידה (
yada):
Abihud,
Abiud,
Ahihud,
Ammihud,
Baale-judah,
Ehud,
Eliud,
Hod,
Hodaviah,
Hodiah,
Ishhod,
Jaddai,
Jedaiah,
Jeduthun,
Jehudi,
Jehudijah,
Judah,
Judas,
Jude,
Judea,
Judith,
Ohad,
Tidal,
Vaniah,
Yaudi
One Body:
NKJ Ephesians 4:4-6 There is one body and one Spirit, just as you were called in one hope of your calling; 5 one Lord, one faith, one baptism; 6 one God and Father of all, who is above all, and through all, and in you all.
NKJ Colossians 3:15 And let the peace of God rule in your hearts, to which also you were called in one body; and be thankful.
I'd also look at all the grafting in discussion in Romans 11. And the fact that the Abrahamic Covenant pertains to Abraham, His Seed, and all the nations. It's now a matter of who are God's Children, the New Creation, in one Body, with one Lord, and one God & Father, under the one New Covenant in Abraham's Seed.