Paul said that the middle wall of partition which stood between the Jewish believers and the Gentile believers had been broken down and both groups are in the Body...
Nope.
What Ephesians 2 is referring to is to the enmity between God and Gentiles that the enmity between Israel and the Gentiles had represented.
Israel (believing or not) had been in Covenant with God.
The Gentiles were not; and were thus with out God in the world.
So there was that.
And then there was the issue of Israel in general, and their Believing Remnant.
Said Believing Remnant of Israel were the actual Israel of God - "the saints" within their nation.
Israel fell at Acts 7.
God having sealed its "saints" and concluded "the rest" blind, Rom. 9-11.
Where was Paul "at that time"?
Right smack where he asserts in Ephesians 2: 3 he and his lost fellow Jews had been "at that time" - lost.
But NOW - O but for God's BUT NOW - this side of Israel's fall at Acts 7.
God's But Now in Acts 9 - the salvation of the first Jew saved AFTER the Spirit concluded Paul and his nation Uncircumcision, Acts 7; Romans 2 and 3.
Which is when He began His NEW Creature: the Body of Christ; in Paul "first" - 1 Tim. 1.
Result?
NOW these formerly lost Jews and Gentiles this side of Israel's fall and subsequent saving of Paul, could get saved under this new salvation - into its Body of Christ.
It is these formerly lost Jews and Gentiles now in the Body starting with Paul, that are now fellow citizens with the saints of Israel (Israel's Believing Remnant prior to Israel's fall).
This household of God, then, is comprised of Two Agencies in His Son...
Ephesians 3:15 Of whom the whole family in heaven and earth is named,
Only after God revealed the Mystery of His will was this Twin Agency concept possible to understand.
Both based on the Blood of His Sons Cross, which is why Peter appears to sound like Paul at times.
Because both Agencies are based on the Cross of Christ...
Ephesians 1:7 In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace; 1:8 Wherein he hath abounded toward us in all wisdom and prudence; 1:9 Having made known unto us the mystery of his will, according to his good pleasure which he hath purposed in himself: 1:10 That in the dispensation of the fulness of times he might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in him: 1:11 In whom also we have obtained an inheritance, being predestinated according to the purpose of him who worketh all things after the counsel of his own will: 1:12 That we should be to the praise of his glory, who first trusted in Christ.
Not that all MADs, and or so called "MADs" appear to have properly sorted all that out.
You are not the first to assert the error you asserted in your above quote, Jerry.
E.C. Moore (who is perhaps the father of the Acts 9 / Acts 28 Hybrid) held your exact same error on that - that the middle wall of partition had been between Believers.
Moore's having been - as with all his many other errors - the result of his having erroneously mixed where the Acts 9 Position studies a thing out from, with where the Acts 28 Position does.
Acts 17: 11, 12.