I can't believe that this is even an argument among Christians. If you have read the New Testament you would understand. Anyone calling the mission to save Jews replacement theology are denying the Word of God. Replacement theology is a lie that will permanently separate the Jew from God. Jesus is God and there is no other way to the Father God except through Christ Jesus.
John 14:6
Jesus said unto him, “I am the Way, the Truth, and the Life; no man cometh unto the Father, but by Me.
If you have a minister saying that you do not need to preach salvation to the Jews he is wrong and misleading you. This isn't replacement of the Jew. They are Jews but they also must be saved. They must accept Jesus Christ as Savior to be saved. To come to the Father.
What is the New Covenant?
https://www.gotquestions.org/new-covenant.html
Romans 1:6
For I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile.
Jesus is clear that not all Jews are Gods people
Matthew 23 Warnings to the teachers of the Law
https://www.biblestudytools.com/matthew/23.html
Matthew 23: 38-39
38 Look, your house is left to you desolate.
39 For I tell you, you will not see me again until you say, ‘Blessed is he who comes in the name of the Lord.’”