More than 1.2 billion people in the world identify as "Catholic." People outside this ancient faith sometimes have trouble comprehending its structure, values, traditions, and beliefs. Idiot's Guides: Catholicism is for any new -- or renewed -- believer. This thorough guide covers everything from the foundational tenets and creeds, the visible signs of Catholicism, and an explanation of specific prayers. An exploration of the Mass, holy days, key people and places, art, literature, and more are also covered in easy-to-understand text.