It coincides with the sacrament certainly, because one cannot be Catholic without baptism, but I do not see how baptism in and of itself makes one (an adult) a Catholic. You must have both, baptism and the Catholic faith. Even in the Creed, confessing one baptism for the remission of sins is only one of the things we Catholics must believe.
But what does it even mean to be a Catholic? One is or is not member of the Church.
This is a purely metaphysical, ultimately unknowable, quality.
What we know, is that the Church Militant is composed of sinners and saints, bad and wicked, not of heretics, schismatics and apostates.
Catechism of Trent:
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The Members Of The Church MilitantThe Church militant is composed of two classes of persons, the good and the bad, both professing the same faith and partaking of the same Sacraments, yet differing in their manner of life and morality.
The good are those who are linked together not only by the profession of the same faith, and the participation of the same Sacraments, but also by the spirit of grace and the bond of charity. Of these St. Paul says: The Lord knoweth who are his. Who they are that compose this class we also may remotely conjecture, but we can by no means pronounce with certainty. Hence Christ the Saviour does not speak of this portion of His Church when He refers us to the Church and commands us to hear and to obey her. As this part of the Church is unknown, how could we ascertain with certainty whose decision to recur to, whose authority to obey?
The Church, therefore, as the Scriptures and the writings of the Saints testify, includes within her fold the good and the bad; and it was in this sense that St. Paul spoke of one body and one spirit. Thus understood, the Church is known and is compared to a city built on a mountain, and visible from every side. As all must yield obedience to her authority, it is necessary that she maybe known by all.
That the Church is composed of the good and the bad we learn from many parables contained in the Gospel. Thus, the kingdom of heaven, that is, the Church militant, is compared to a net cast into the sea, to a field in which tares were sown with the good grain, to a threshing floor on which the grain is mixed up with the chaff, and also to ten virgins, some of whom were wise, and some foolish. And long before, we trace a figure and resemblance of this Church in the ark of Noah, which contained not only clean, but also unclean animals.
But although the Catholic faith uniformly and truly teaches that the good and the bad belong to the Church, yet the same faith declares that the condition of both is very different. The wicked are contained in the Church, as the chaff is mingled with the grain on the threshing floor, or as dead members sometimes remain attached to a living body.
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If we fall into heresy or apostasy or etc. then we commit mortal sin, if we die in that state then we go to hell, Catholic or not, it makes no difference - well, if there is a difference, we should expect that our suffering will be greater than non-Catholics.
True, but they are different categories.
Someone outside cannot possibly be saved.
Someone inside, will be judged for his sins.
But *for Catholics*, no matter what their sin, in an emergency it does not matter what offense we're guilty of, we can still be absolved in the sacrament of penance - which is something only Catholics can do.
Provided we have good will and are genuinely penitent that is... yes?
So when the issue confuses, remember the fundamental teaching that no matter what our heresy, excom, mortal sin, etc., when in danger of death, we always can still go to confession, something non-Catholics cannot do. One reason that many heretics, schismatics, etc. do not take advantage of this, is likely because as they lived, so they shall die - in their sins.
If I am wrong, please tell me where I erred.
The bolded part is very important, especially in the context of the following comment: