No, friend, you are way out in left field.
Ephesians 3:6 clearly tells us that Gentiles are fellowheirs with Jews.
How, then, are they not partakers of the New Covenant?
Clearly, Paul says that this is a revelation given to God's apostles.
The delusion that God sends on the whole world will be because they believed not the truth but had pleasure in unrighteousness.
Just because the first Jewish Christians discuss the New Covenant in their writings there is no covenant God makes with Gentiles. The key Scriptures are where the original Covenant is mentioned in Jeremiah 31:31-34 and there are no Gentiles named or mentioned in this Covenant God made with the House of Israel. IF God wanted to have Gentiles in the New Covenant He would have said so right when the prophecy came forward.
6 That the Gentiles
should be fellowheirs, and of the same body, and partakers of his
promise in Christ by the gospel: Eph 3:6.
There is no mention of Covenant nor is Saul initiating or starting a new covenant in these words.
Saul is doing what everyone who had interest in Israel in what God was doing and searched the Law, the Psalms, and the Prophets to understand this New Covenant, and although Saul says that Gentiles
should be fellowheirs and of the same body, and partakers of his promise IN CHRIST, merely discussing this does not make it a covenant. And the subject has to do with "IN CHRIST" which is not saying they are fellowheirs in the New Covenant, for IF God had wanted to make covenant with Gentiles or include Gentiles in the New Covenant God made with the House of Israel, He would have said so through Jeremiah. But He hasn't and He didn't. The New Covenant God made is with the House of Israel. The Messiah is a Jewish Messiah Promised by God TO and FOR the House of Israel, and there are no Gentiles in the New Covenant. God is saving Gentiles WITHOUT covenant.
But seeing that everyone wants to use Saul's words to prove a new covenant now with Gentiles, then what do we do with the New Covenant God made with the House of Israel and the House of Judah? There can't be two covenants. No, there is not. There is only one Covenant and the one that's in existence today is called the New Covenant and Jeremiah describes it in his book, and there are no Gentiles mentioned or named in this Covenant. The Times of the Gentiles exists for one main purpose and that is to bring in Gentiles and to make Israel His Bride jealous. And when this Age is over - and it will come to an end - God turns His full attention back on Israel and He will bring in the New Covenant He made with the House of Israel and pick up where He left off and that was when He sent the Romans to destroy their Temple. Blindness in part has happened to Israel UNTIL the Times of the Gentiles be come in (end.) And then ALL Israel shall be saved. It doesn't say they will come to accept Jesus bar Joseph as their Messiah but merely that ALL Israel shall be saved.
And when God does turn His attention back on Israel guess who's going to get jealous and turn against Israel?
The Gentile Church.
The two prophets will not only use the Law, the Psalms, and the Prophets to lead and teach Israel that Jesus is their Messiah, but they will also prophesy against the Gentile Church and clear up all this misunderstanding and PROVE God made no covenant with Gentiles and this is going to have such a profound effect upon them that they will literally do what Saul did to the Jewish Church before his conversion.
The Gentile Church will come against Israel who holds all the covenants, and the promises and:
Who was before a blasphemer, and a persecutor, and injurious: 1 Timothy 1:13.
Three stages.
First, they will
blaspheme Israel.
Then it will become more overt, and they will
persecute Israel.
Finally, they will actually lay hands on Israel and become
injurious against Israel.
When Christ returns as according to Law, Psalms, and Prophecy the first thing He will do is to subdue the Gentile Church for they are out of control.
The two Jewish prophets God sends to Israel will clear up this 'Gentiles are in the New Covenant' misunderstanding and when they tell the Gentile Christians they were never part of the New Covenant, the same I am doing today, they will not like it nor the two prophets who tell them and will take part in killing them.
Then they will send gifts to one another like it's Christ-mass.
4
Who are Israelites; to whom pertaineth the adoption, and
the glory, and
the covenants, and
the giving of the law, and
the service of God, and
the promises;
5
Whose are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever. Amen. Rom. 9:4–5.
Since the destruction of the Jewish Temple the Gentile Christians had it wrong all this time.
But Christ is going to clear it all up.