catholic means including a wide variety of things; all-embracing.
and
Catholic means of the Roman Catholic faith.
But whenever I hear the someone say, "I'm catholic", it's hard for me to distinguish which usage are they referring to (even with the context). In writing, its easy to differentiate them by the lowercase/uppercase beginning.
My question, though, is what is the origin of the meaning of these two words? I get confused more because I associate the Catholicism with conservatism which is kinda the opposite of being catholic.