Very specifically: Romans 11 where he discusses who is grafted into whom.shalom b'shem Yah'shua
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.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.
I am well aware of who is grafted into whom. But don’t forget that Paul also prayed for the conversion of the Jews in Romans 9 and 10. He even preached to them. We should do the same.
As for Jesus’ name, I know that His name in Hebrew is Y’shua. But remember that the New Testament was written in Greek. His name in Greek is Iesous, which is transliterated as Jesus in most English translations. No translation that I know of has ever translated the name as Je-zeus, nor has anyone that I know of ever called Him Je-zeus. I certainly don’t call Him Je-zeus. I call him Jesus. The name Jesus has no connection with Zeus whatsoever. If you don’t believe me, look up the name “Jesus” in the Strong’s Concordance. There’s no mention of Zeus in the entry on Jesus.
You really need to back off from the highly excessive preoccupation with Judaized Christianity you seem to have, and use some common sense.
Maybe you need to re-read Paul. There aren't two olive trees, or ten, or a hundred.
There is only one. One faith, one baptism. See Ephesians 3:4-6.