shalom b'SHEM Yah'shua HaMashiach Adonai
Very specifically: Romans 11 where Paul discusses who is grafted into whom.
NAsbU Romans 11:17 But if some of the branches were broken off,
and you, being a wild olive, were grafted in among them
and became partaker with them of the rich root of the olive tree,
NAsbU Romans 11:19 You will say then, "Branches were broken off
so that I might be grafted in."
Paul warns against the pride of a Gentile follower of Yah'shua.
NAsbU Romans 11:22 Behold then the kindness and severity of God;
to those who fell, severity, but to you, God's kindness,
if you continue in His kindness; otherwise you also will be cut off.
NAsbU Romans 11:23 And they also, if they do not continue in their unbelief,
will be grafted in, for God is able to graft them in again.
A Jew who comes to know the Jewish Messiah for their salvation
does not become a Christian,
They become a "called out one", a member of the Ekklesia.
They become a Messianic Jew.
The L-rd's name ( Shem ) is not je-zeus;
it is Yah'shua ( YHvH is my salvation )
NAsbU Romans 10:13 for "WHOEVER WILL CALL ON THE NAME OF THE LORD WILL BE SAVED."
Which is why you must call on His Name for salvation.
Its too bad that historical revisionism gets used as a club against fellow Christians.
For 2000 years most Jewish converts to Jesus Christ have had no problem identifying themselves as Christians and members of His Church. That is until a small sub-group of believers, some being ethnic/cultural Jews, decided that a new name was needed for their sub-group. The invented the belief system of Messiah Judaism and started calling them selves Messianic Jews (even though most the adherents to this new fangled sect are not ethnic or cultural Jews). They gave the impression that somehow they (and they alone) were getting back to authentic, first century Christianity (oops, I meant) Messianic Judaism. They utilized many techniques to give this impression, such as the prominent use of those annoying transliterations of names from one language to another. (Question, do Chinese-speaking Messiah Jews transliterate Yah'shua and "Sha-ul" into Mandarin?)
And so, some of them apparently like to castigate anyone who questions the theological presuppositions and foundations of their innovations by labeling them prideful, anti-Semitic, and other similar unfaltering names, perhaps not realizing how prideful they themselves can appear by such tactics.
And so, rather than build up the one new man that Paul speaks of in Ephesians 2, the commonwealth made up of Jews and gentiles together without regard to past religious distinctions, we have this group of self-described Messianic Jews (mainly gentiles) who are attempting to rebuild the religious wall that Paul says has been torn down. Some of them act as if those Christians down through the ages (whether Jews or gentile) who have wished to be identified as the true sons of Abraham, the spiritual Israel of the Bible, are somehow encroaching upon their sacred territory. They have invented concepts like "gentile Christianity" to berate faithful followers of Our Lord down though the centuries.
They seem to forget the words of Paul, "There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. And if you are Christ's, then you are Abraham's seed, and heirs according to the promise." (Gal. 3:28,29)