What about those outside the Church who belong to other Christian faiths or world religions? I do not have enough space here to give an adequate answer to this question. I strongly recommend studying the Catechism's coverage of this matter in nos. 836-845. The opening statement is instructive: "All men are called to this catholic unity of the People of God. . . . And to it, in different ways, belong or are ordered: the Catholic faithful, others who believe in Christ, and finally all mankind, called by grace to salvation" (no. 836).
Members of other Christian churches who believe in Christ and have been properly baptized are in a certain, though imperfect, union with the Catholic Church. With the Orthodox churches, this union is so close that it lacks little to attain the fullness that would permit a common celebration of the Eucharist.
The Church maintains a special relationship with the Jewish people. As the People of God in the New Covenant, the Church has a deep link with the Jewish people, who were the first to hear God's Word. "Unlike other non-Christian religions, the Jewish faith is already a response to God's revelation in the Old Covenant." Regarding the Messiah, Jews and Catholics have similar goals about the future.
Catholics await the return of the Messiah, who died and rose from the dead and is recognized as Lord and Son of God.
Jews await the coming of a messiah whose features remain hidden until the end of time. Their expectation, therefore, is accompanied by the mystery of their not knowing or misunderstanding Jesus Christ when He comes again. The Catechism proceeds to discuss the Church's positive relationships with the Muslims and other non-Christian religions that developed quite independently of Judaism and Christianity. "The Catholic Church rejects nothing which is true and holy in these religions" which "often reflect a ray of that Truth which enlightens all men" (Declaration on the Relationship of the Church to Non-Christian Religions, no. 2). The commitment of the Church to ecumenical and interfaith dialogue with other believers is a major effort to fulfill the Father's will that all people be gathered together into His Son's Church.*****
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The Church is the place where humanity must rediscover its unity and salvation," St. Augustine wrote (Sermon 96, 7). "The Church is the world reconciled. She is the bark which in the full sail of the Lord's Gross, by the breath of the Holy Spirit, navigates safely in this world." --------------------------------------------------------------------------------
It seems to me that this link explains some things but that the church still thinks it is the true church and other christian denominations are just slightly less than the perfection of the Catholic Church via this paragraph:
Members of other Christian churches who believe in Christ and have been properly baptized are in a certain, though imperfect, union with the Catholic Church. With the Orthodox churches, this union is so close that it lacks little to attain the fullness that would permit a common celebration of the Eucharist.
Where have I misunderstood this paragraph?