Romans 9-11 teaches that all who reject Jesus become God’s enemies and the Jewish people are no different. They have rejected the Messiah, God the Son; therefore, they have rejected God himself. Like the rest of humanity without Christ, they are dead in their sins and enemies of God.
If God is your enemy, who can you turn to for help?
You can only turn to God and God has made a way by sending a Saviour, the Lord Jesus Christ. Without Christ, God is your enemy.
Romans 11:25-26 is a controversial passage:
Lest you be wise in your own sight, I do not want you to be unaware of this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in. And in this way all Israel will be saved… (Romans 11:25-26)