If one can disbelieve the Primacy of the Pope, and instead that the Pretender wearing the Pope's garments is in fact the anti-Christ, and still believe they are an adherent of Catholicism, then they have asserted a Schism in the Church and that other Catholics are Apostate. You may choose to continue to use the label "Catholic", for convenience or perhaps because you think you are the One True Catholic, but the word no longer has meaning.
For a Church to place a permanent label on a person who holds Apostate beliefs is simple paternalism. A self-declared Atheist is not a Catholic, no matter what any dude with a pallium or a ferula might have to say about it.
For a Church to place a permanent label on a person who holds Apostate beliefs is simple paternalism. A self-declared Atheist is not a Catholic, no matter what any dude with a pallium or a ferula might have to say about it.