That is, in the Hebrew scriptures.
Friend, it is called the new covenant, that is, the feasts of the Lamb of God.
Thoses feasts were only meant for the Jewish people only.
That is, in the Hebrew scriptures.
All of the Word of G-d is for our understanding. I would start by reading Romans Very specifically: Romans 11 where he discusses who is grafted into whom.
The L-rd's name ( Shem ) is not je-zeus; it is Yah'shua ( YHvH is my salvation ) Which is why you must call on His NAME for salvation. First there is only ONE YHvH; our Elohim.
shalom b'SHEM Yah'shua HaMashiach
discussing Who is Grafted into Whom. NAsbU Romans 11:17 But if some of the branches were broken off,
Paul warns against the pride of a Gentile follower of Yah'shua.
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." NAsbU Romans 11:22 Behold then the kindness and severity of God;
A Jew who comes to know the Jewish Messiah for their salvation
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.
does not become a Christian,
They become a "called out one", a member of the Ekklesia.
They become a Messianic Jew.