mikhail said:
So what makes you Catholic then?
Me personally? I'm a Cafeteria Everything. I haven't considered myself exclusively Catholic since the 80s.
But I'm guessing you're directing this question in the general case...
At one extreme, what really makes one a Methodist, Calvinist, Presbyterian or Baptist? There is an element of religious self-determination here: you are what you say or think you are. And within any religion, you have opposing factions that prefer bend versus break or vice versa.
Religious purists and conservatives ("break") lament the impurity that the "believers on the fence" bring. Yet they are often outnumbered by many who participate in religions like Catholicism or Bhuddism or Shintoism as a construct upon which to facilitate the self-discovery of their own personal metaphysical beliefs ("bend"). There are many people in the "bend" category that appreciate the foundation their choice of religion offers, plus the social aspects, and yet don't feel that their beliefs can simply be "mandated" by another authority and yet remain genuine.
This is a conflict that is playing itself out in Islam to a very public degree (though the conflict doesn't have a singular authoritarian voice, which exacerbates matters). But it's also true in Catholicism (I have inkings that American bishops may break off into a separate Catholicm if truly forced to by the Vatican, btw), Presbyterians and their position on gays, etc.
I don't think a dictionary definition of religious faith does it any justice, because, as George W Bush proves, religious faith isn't something that can be handled with clinical precision.
So what are we left with? Anglicans connect and identify with the Church of England, Catholics connect and identify with the Vatican, etc. There are so many gray areas of "how practicing do you need to be to be a member of x faith?", and so many different people who interpret those boundaries, that all we're left with is generalizations and rules of thumb.