Yet it was not through Yah’shua Messiah that gentiles were welcomed into the flock, thus religious doctrine that says that Messiah came for pagan gentiles because they had never before been welcome to join the House of YHVH is misleading and out right heresy.
Exodus 12:40 Now the sojourn of the children of Israel who lived in Egypt[a]was four hundred and thirty years. 41 And it came to pass at the end of the four hundred and thirty years—on that very same day—it came to pass that all the armies of the LORD went out from the land of Egypt. 42 It is a night of solemn observance to the LORD for bringing them out of the land of Egypt. This is that night of the LORD, a solemn observance for all the children of Israel throughout their generations... 48 And when a stranger dwells with you and wants to keep the Passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as a native of the land. For no uncircumcised person shall eat it. 49 One law shall be for the native-born and for the stranger who dwells among you.”
50 Thus all the children of Israel did; as the LORD commanded Moses and Aaron, so they did.
As written in Scripture, at the time of the Exodus from Egypt YHVH has never rejected any pagan gentile but HE has always required the gentile to assimilate to HIS House rules, not bring theirs into HIS. The term Jew was 1st established as a religious label for the house of Judah because it was they that YHVH gave the responsibility to preserve the integrity of HIS TORAH. And I must say, they have done an awesome job. Perfect no, but the integrity is still in tact.
I know of no Christians who claim that Christ came from gentiles.... rather that Jesus came from the lineage of the Jews...He was a Jew.
I am trying to determine which Messianic Jews Teachings you are referencing in your posts..... for there are many branches which have shot off from their intial beginnings. Your teachings center primarily as referencing specifical y Jesus as Yah'shua with a strong attachment to the Torah as central to your beliefs. There are several as this with in the Messianic Jews arena....though I understand you do not claim yourself as one...but the teachings you're given are very much so.