The word Catholic appears in the main Christian creeds (formal definitions of belief), notably the Apostles' Creed or the Nicene Creed. Christians of most denominations, including most Protestants, affirm their faith in "one holy catholic and apostolic Church." However for protestants this affirmation refers to their belief in the ultimate unity of all churches under one God and one Saviour, rather than in one visibly unified church. In this usage catholic is usually written with a lower-case c, while upper-case C refers to the sense discussed in this article.
2 -[Catholicism : Origin and History]
3 -[Catholicism : Sacraments]
4 -[Catholicism : Rites and churches]