8.149. Didn’t John Paul II say the Church of Christ exists in other Christian groups with valid sacraments? Doesn’t that mean they’re part of the Church too?

Yes, John Paul II wrote:

The Church of Christ is effectively present in all the communities of the faithful which preserve the apostolic succession and a valid Eucharist.
— Antipope John Paul II, Redemptor Hominis (1979)

This is a heretical statement, and it reflects a core error of Vatican II’s false ecclesiology, namely the idea that the Church of Christ subsists in the Catholic Church, but also “exists” or is “present” in other communities that have partial elements of the Faith.

But this directly contradicts Catholic dogma, especially the infallible teaching Extra Ecclesiam Nulla Salus—Outside the Catholic Church there is no salvation—and the constant teaching of the Church Fathers and pre-Vatican II Popes. The Church of Christ is the Catholic Church and only the Catholic Church, and there can be no partial or fragmentary membership in it without full submission to the Pope, the hierarchy, and the Catholic Faith.

No community that rejects the papacy, teaches heresy, or is separated from the visible unity of the Church can be considered part of the Mystical Body of Christ. To say otherwise is to deny the visible unity and exclusivity of the true Church founded by Christ.

Category Traditional Catholic Teaching John Paul II / Vatican II Position Remarks
Definition of the Church The one, visible Catholic Church under the Pope The Church of Christ “subsists in” the Catholic Church, but is also “present” elsewhere Destroys the Church’s exclusive identity; implies fragmentation
Church Unity Unity in Faith, Sacraments, and hierarchical communion “Imperfect communion” with heretical and schismatic sects No such thing as partial membership in the Mystical Body
Valid Eucharist Only bears fruit in the context of full union with the Church Valid Eucharist implies Church presence, even outside Rome Contradicts the principle that sacraments outside the Church do not sanctify
Apostolic Succession Valid succession only within lawful hierarchical communion Recognizes succession even in schismatics (e.g., Orthodox) Succession without communion is illicit and spiritually dead
Salvation Only within the Catholic Church, by supernatural Faith and obedience Other communities may be “means of grace” or “salvation” This is the condemned heresy of religious indifferentism
Fruits Conversion to the Catholic Church, missionary zeal, martyrdom Ecumenism, joint prayer services, false unity, indifferentism “By their fruits you shall know them” (Matt. 7:16)

Summary:

John Paul II’s claim that the Church of Christ is “present” in other Christian communities because they retain “apostolic succession” or a “valid Eucharist” is not a clarification of doctrine—it is a denial of it. It destroys the visible unity and exclusivity of the Catholic Church, leads souls to believe they can be saved while remaining in heresy or schism, and fosters false ecumenism.

The true Church of Christ is the Roman Catholic Church—not a concept, not a spirit, not a fragmented presence. It is one, visible, hierarchical, and exclusive, and only those fully submitted to her authority and professing her faith can be counted among her members.

As Pope Leo XIII taught infallibly:

It is absurd to imagine that he who is outside can command in the Church.
There can be nothing more dangerous than those heretics who admit nearly the whole cycle of doctrine, and yet by one word… corrupt the faith.
— Pope Leo XIII, Satis Cognitum (1896)

Further reading:

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8.148. Doesn’t the Church teach that tradition is living and grows with time? Isn’t it normal for the Church to develop?

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8.150. Didn’t Pope Francis say that the unity of all peoples is already realized in Christ? Doesn’t that mean the world is already united to Him?