Religious factions are organizations that follow and profess a common religion. Fictional religious institutions are common factions in fictional worlds where they can be used to explore themes of morality, sin, death, and the meaning of life. In fictional settings there may a single, dominant religious faction, or there may be several competing ones leading to religious wars and other important historical events. Religious factions often insert themselves into geopolitics, and religious leaders may be advisors to kings, presidents, or other world figures (if they themselves are not running a theocracy).