There are a variety of articles on wikipedia that list people of a particular religious belief. These lists are not exhaustive: there is no encyclopedic benefit to listing every single member of each religion. People are selected on various criteria - ideally they should have wikipedia articles of their own, and be in some way noteworthy for their belief.
... Charles became joint-king of Castile with his mother (who was insane), and also inherited Aragon, Navarre, Granada, Naples, Sicily, Sardinia, and Spanish America[?]. After ...