You keep forgetting about the New Covenant that your favorite Apostle of all times (Paul) allowed Gentiles to participate in as the Lord's Supper. Your Ethnic Cleansing spirit must be convulsing in sheer agony because of that fact. Tell us its name so that we can proceed with its exorcism.
The last Passover only Jews were participating in that meal as first directed by God in Egypt when the first Passover was made.
The high priest made sacrifices to and for the children of Israel. He never made sacrifices for Gentiles, did he? No, he didn't. Jesus said He came to "fulfill the Law [of Moses.]" This means Jesus was sacrificed for those under the Law as Saul says in Galatians 4:
4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
5 To redeem them that were under the law, that we might receive the adoption of sons. Gal. 4:4–5.
Gabriel told Mary to name their child "Jesus" for He SHALL save HIS PEOPLE (the Jews) from
their sins."
In Romans Saul also says:
4 Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;
5 Whose are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever. Amen. Rom. 9:4–5.
Romans 9 is an exhaustive example of salvation and all its parts. Gentiles are not named nor included. It is a Gentile interpretation that violates Scripture where Gentiles attempt to add Gentiles into the three Hebrew covenants: Abraham, Mosaic, and New, where there is no mention of Gentiles in any of these three Hebrew Covenants. Any interpretation that contradicts the Old Testament Jesus said is to be rejected as false teaching. Such interpretations "break" Scripture. Jesus said 'this' cannot be done. So, why do you continue to break Scripture by adding Gentiles to the Hebrew covenants after the fact? God made no covenant with Gentiles. If He did there would be a Gentile 'bible' There is no Gentile bible/Scripture made that records God dealing with Gentiles as there is Scripture record of God dealing with Israel in the Old Testament. If you want to add Gentiles into the three Hebrew covenants recorded in the Old Testament, then go right on and do that. It is still a lie and a false interpretation of God's Word.