All or nothing...

Such is the nature of Catholicism that it does not admit of more or less, but must be held as a whole or as a whole rejected: "This is the Catholic faith, which unless a man believe faithfully and firmly; he cannot be saved" (Athanasian Creed). There is no need of adding any qualifying terms to the profession of Catholicism: it is quite enough for each one to proclaim "Christian is my name and Catholic my surname," only let him endeavour to be in reality what he calls himself.
-- Pope Benedict XV

Well really, who would want a faith that says, "You can take all this stuff cum grano?" Or that you should decide on your own what is true? What's the point?