Chelsea, that is interesting, I totally agree, but add that I was just doing some in depth reading on excommunication, and the concept is that once baptized a Catholic, you are a Catholic, no matter how recalcitrant or obstinately opposing you might be. Untiil you are excommunicated (or seek to excommunicate yourself, through request or deed), you are "one of us."
A person is Catholic as long as he is a member of the Mystical Body of Christ, exactly, even dead members steeped in and thoroughly attached to mortal sin (though their catholicity doesn't save them from hell).
However, I'm speaking only of those who ARE excommunicated in the most euphemistic terms I know how. Those who are anathema are excommunicated in the order of divine law; those who incur latae sententiae or ferendae sententiae excommunication are excommunicated in the order of Church law. This is a great many people, I'm afraid...all stricken from the Mystical Body and no longer Catholic. I am not making the statement that any specific person is not Catholic, though.
Most people will tell you that it is very difficult to excommunicate one's self by a sentence already established Church law for a specific crime (incur latae sententiae excommunication). However, if one were actually to read can.s 1321-1325, one would see that excommunication is likely imputed to a person more often than it is excused or tempered. For anathema it's even easier to incur the penalty, in most cases all one has to do is say some specific proposition.
I am in complete agreement. As long as a person remains a member of the Mystical Body, he is Catholic...no getting around that.