839 "Those who have not yet received the Gospel are related to the People of God in various ways."325
The relationship of the Church with the Jewish People. When she delves into her own mystery, the Church, the People of God in the New Covenant, discovers her link with the Jewish People,326 "the first to hear the Word of God."327 The Jewish faith, unlike other non-Christian religions, is already a response to God's revelation in the Old Covenant. To the Jews "belong the sonship, the glory, the covenants, the giving of the law, the worship, and the promises; to them belong the patriarchs, and of their race, according to the flesh, is the Christ",328 "for the gifts and the call of God are irrevocable."329
The Jewish people still follow the Old Covenant, which God never revoked while Christians follow the New Covenant. For example, it was God who established circumcision (see Genesis 17:11). Man never established circumcision.
Although the Jewish people follow the Old Covenant, they still must follow God's will to obtain eternal salvation. Being a Jew will not earn them salvation. After all, Christ said, "Not everyone who says 'Lord, Lord's will enter the Kingdom of God, but he who does the will of my Father in Heaven will enter the Kingdom of God. " When Jesus spoke those words, He was addressing the Jewish people. Nevertheless, these same words also apply to us. Not every Catholic who says 'Lord, Lord's will enter God's Kingdom, but he who does the will of God the Father. The Jews are the Old Israel while Christians are the New Israel. Both are the people of God.