I've read some opposing views/opinions in this thread, I'll add one more:
Commonwealth of Israel - Physical & Spiritual
Eph 1:1 Paul, an apostle of Jesus Christ by the will of God, to the saints which are at Ephesus, and to the faithful in Christ Jesus:
(NOTE: Written to NT saints/believers/those spiritually indwelt/sealed via Christ's Holy Spirit (2 Cor 1:22, 5:5, Eph 1:14, 4:30, 2 Tim 1:14)
Eph 2:
1 And you hath he quickened, who were dead in trespasses and sins;
(NOTE: Belief/faith in Christ has quickened = made you SPIRITUALLY alive)
5 Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved
(NOTE: Before you believed, said or did anything, Christ paid your sin debt & was raised for your justification (Rom 4:25). Belief/faith in Christ's sin payment & resurrection quickened/made you SPIRITUALLY alive)
11 Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands;
NOTE: This circumcision/covenant is SPIRITUAL & preformed SPIRITUALLY without hands)
12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
(NOTE: All gentile's were aliens from PHYSICAL Israel. Strangers living outside God's covenants of promise, having no hope, living without God)
13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
(NOTE: BUT NOW! these gentiles who WERE aliens & strangers lost/without hope from covenants of promise. Thru FAITH in Christ's sin payment & resurrection have been quickened/made SPIRITUALLY alive/grafted in/sealed by Christ with His indwelling Holy Spirit are part of the true SPIRITUAL Israel)
14 For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us;
(NOTE: In the Temple stood a partition wall. No gentile could go beyond this dividing wall, where Torah was read)
15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
(NOTE: One new SPIRITUAL man via Christ's baptism with His indwelling Holy Spirit (Matt 3:11). This gift is given to whoever believes/places their faith in Jesus sin payment & resurrection. This new covenant, SPIRITUALLY written in our/twain/both (believing Jew or Gentile) heart (2 Cor 3:2-3, Heb 8:10) & advocated by our/twain/both High Priest/Christ (Heb 4:14, 1 Jn 2:1-2) after the order of Melchizedek, (Heb 5:6, 6:20, 7:15) whether Jew or Gentile (Rom 1:16, Rom 10:12, Gal 3:28, Col 3:11)
16 And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
(NOTE: Believers are reconciled unto God via belief/placing their faith in Jesus sin payment & resurrection)
17 And came and preached peace to you which were afar off, and to them that were nigh.
18 For through him we both have access by one Spirit unto the Father.
(NOTE: Reconciliation is by grace thru faith & SPIRITUALLY accessed (Rom 5:1-2, Eph 2:8) whether Jew or Gentile)
19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;
(NOTE: Once Christ baptizes with His indwelling Holy Spirit. You become a citizen of God's house/Israel. Also see Phil 3:20)
Throughout scripture two kingdoms/houses: physical & spiritual are revealed.
Cain physical, Abel spiritual
Ishmael physical, Isaac spiritual (See Gal 4:22-31)
Esau physical, Jacob spiritual
Israel physical, Body of Christ/Church spiritual
Adam physical, Christ Spiritual (1 Cor 15:45)
It's the NT (post Acts 2:4) SPIRITUAL Israel which ALL believer's Gentile or Jew are grafted (a covenant circumcision preformed SPIRITUALLY without hands) via Christ's baptism with His indwelling Holy Spirit.