Wow...wow...You couldn’t be more wrong if you tried. The “purpose of Ephesians is the bringing the two houses of Rm 11, the gentiles being the house of Gen 48:19, back together into one new man in and through Messiah...” Since the one new man Paul speaks of is a MYSTERY, kept SECRET SINCE the world began, hid in God from the foundation of the world, and planned by Him from BEFORE the foundation of the world until revealed to the Apostle Paul, explain how, from the Scriptures, Gen. 48:19 brings Jew and Gentile “back together”...
Those who see no disctinction between Israel and the church are in for a big surprise.
Micah 5:2 “But you, Bethlehem Ephrathah, though you are little among the thousands of Judah, yet out of you shall come forth to Me the One to be Ruler in Israel, whose goings forth are from of old, from everlasting.”
Now go read the rest of Micah 5, Jacob who is Israel is in the midst of the nations as if she is eaten up by them, she walks, talks and acts like them because she has forgotten her Maker and His Law is a strange thing to her as we read in Hosea.
He was not sent except to the lost sheep of the house of Israel, but then as Paul says, not all Israel is Israel because God's house is not made up of the seed of man, but of the seed of Messiah, the seed of the woman who is the bride of Messiah and who the promise of Gen 3:15 given to, just as it was given to Sarah, not to Hagar.
Paul speaks of grafting in and then warns those grafted in not to boast against the natural branch. Why? Because Messiah said that salvation comes from the Jews. Paul says to Judah first, why? Because to Judah was given the promise of the eternal scepter, the Law holder of the Father, the one who is to rule and judge rightly by the Word of God, not adding to and not taking away, but ruling according to all that God has said and written.
God only has one house. He named that house Israel and so all who come to join His house, join the house of Israel which is neither Jew or gentile. Caleb was born a Canaanite, so how did he become a member of Judah? Because he wholly followed God's commands because he had a different spirit within him, God's spirit of truth. Of all the adult males of the tribe of Judah who left Egypt, the only one who entered the Promised Land was the one who was grafted in, not the one who was born of the seed of man, but the one of the seed of Messiah. Yes there were those of the physical seed of Judah who entered, but all those had been born in the wilderness. There was only a remnant who left Egypt who entered into the Promised Land and that remnant was Joshua that natural branch and Caleb the grafted branch, both who wholly followed the commands of God because they wholly believed in the promise of Messiah and eternal life.
Have you never read Hebrews 3-4 and how those who died in the wilderness never enter into His rest? Into His eternal kingdom? Have you never read in 1Cor 10 where Paul says that those in the wilderness became examples of disobedience that we are to learn from?
John 3:36 He that believeth in the Son, hath everlasting life, and he that obeyeth not the Son, shall not see life, but the wrath of God abideth on him.
As it was for them in the wilderness, so it is true for us, as to them the Gospel message was first given, which because it was not mixed with faith that God will deliver on all the promises He made, only a remnant actually received the reward of the promise and entered the Promised Land. The Promise Land then being a shadow and type of the Promised Land to come at Messiah's return.
Well, if one actually reads and studies the chapters that come before Rm 11, then one knows that Paul is speaking of Rm 7 in which I might add, that unless you understand the Law of God, he, Paul, is not speaking to you.
Rm 7:1 Or do you not know, brethren (for I speak to those who know the law), that the law has dominion over a man as long as he lives? ... but if her husband dies, she is free from that law, so that she is no adulteress, though she has married another man. 4 Therefore, my brethren, you also have become dead to the law through the body of Messiah, that you may be married to another—to Him who was raised from the dead, that we should bear fruit to God.
And why was this a big deal to those Paul was speaking to?
Jer 3:8 Then I saw that for all the causes for which backsliding Israel had committed adultery, I had put her away and given her a certificate of divorce; yet her treacherous sister Judah did not fear, but went and played the harlot also.
Law Concerning Divorce
Dt:24 “When a man takes a wife and marries her, and it happens that she finds no favor in his eyes because he has found some uncleanness in her, and he writes her a certificate of divorce, puts it in her hand, and sends her out of his house, 2 when she has departed from his house, and goes and becomes another man’s wife, 3 if the latter husband detests her and writes her a certificate of divorce, puts it in her hand, and sends her out of his house, or if the latter husband dies who took her as his wife, 4 then her former husband who divorced her must not take her back to be his wife after she has been defiled; for that is an abomination before the Lord, and you shall not bring sin on the land which the YHVH your God is giving you as an inheritance.
So because they, the lost sheep, the ones who went spiritually whoring by worshiping according to what was right in their own eyes rather than according to the Way God commanded them to worship Him, they were banned from returning and had remained under the eternal curse of the Law of divorce, which is death. But God being a merciful God and not taking pleasure in the death of any man, God provided a way for them to enter back into His house.
And that is the “Good News”, that through Messiah, the lost sheep who had become the “fullness” of the gentiles, was freed from the curse of the Law by the redeeming blood of Messiah. They are now able to enter back into the household of God and be partakers in all the covenants of promise.
Gal 3:13 Messiah has redeemed us from the curse of the Law, having become a curse for us (for it is written, “Cursed is everyone who hangs on a tree”), 14 that the blessing of Abraham might come upon the Gentiles in Messiah Yeshua, that we might receive the promise of the Spirit through faith.