When studying religion, it is indispensable to study the organizational system of that religion. Research on the organizational system will tell us about the founder, the organizational structure associated with operational activities associated with the roles, functions and duties of believers, dignitaries, and positions. This book deals with the organizational system of 14 recognized religions (organizations) operating in Vietnam. The content refers to the process of birth and formation; system of organizations of some religions; Functions and powers of each organization in the ecclesiastical organizational system, dignitaries, clergy, believers...