Core tenet of Catholicism
The Church is one, holy, catholic, and apostolic.
Continuity from the apostles through the bishops, with Peter's successor at the center.
Understanding it — context, not catechism: how this passage is held
The four marks — one, holy, catholic, apostolic — come from the Nicene Creed and every Christian body claims them; the Catholic argument is that they subsist fully in a visible institution with an unbroken succession of bishops in communion with Rome. Vatican II softened the exclusivity considerably, recognizing "elements of sanctification" outside its bounds and calling Orthodox churches sister churches, which was a significant change in how the claim is stated without changing the claim itself.
The same ground, other faiths
claims that share this one's ideas
Communion with Rome, without becoming Latin.
The Chaldean Catholic Church
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Reformed, and still Eastern.
The Malankara Mar Thoma Syrian Church
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Armenian in rite, Catholic in communion.
The Armenian Catholic Church
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The same rite, in Roman communion.
The Syriac Catholic Church
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The church is the body of Christ.
Christianity
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Leadership was appointed, not chosen.
Islam
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