4.15. What about the Vatican II popes — aren’t they the legitimate successors of St. Peter?

No. While they may have been material claimants to the papacy, they could not be formal popes, because a manifest heretic cannot be pope. This is the unanimous teaching of saints, doctors, canonists, and theologians.

Pope Paul IV’s 1559 bull Cum ex Apostolatus Officio teaches that even if a man is elected pope by all the cardinals, his election is null and void if he had previously deviated from the faith.

The Vatican II popes — from John XXIII to Leo XIV — publicly taught heresies (e.g., religious liberty, false ecumenism) and promoted sacrilegious disciplines, which is incompatible with holding the papal office.

Further reading:

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4.14. Isn’t the Church supposed to be visible? How can it be if there’s no pope?

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4.16. But Leo XIV was elected by a conclave and is universally accepted — doesn’t that make him the Pope?