From The Art and Popular Culture Encyclopedia
A schism is a division between people, usually belonging to an organization or movement religious denomination. The word is most frequently applied to a break of communion between two sections of Christianity that were previously a single body, or to a division within some other religion. It is also used of a split within a non-religious organization or movement or, more broadly, of a separation between two or more people, be it brothers, friends, lovers, etc.
A schismatic is a person who creates or incites schism in an organization or who is a member of a splinter group. Schismatic as an adjective means pertaining to a schism or schisms, or to those ideas, policies, etc. that are thought to lead towards or promote schism.
In religion, the charge of schism is distinguished from that of heresy, since the offence of schism concerns not differences of belief or doctrine but promotion of, or the state of, division. However, schisms frequently involve mutual accusations of heresy. In Roman Catholic teaching, every heresy is a schism, while there may be some schisms free of the added guilt of heresy. Liberal protestantism, however, has often preferred heresy over schism. Presbyterian scholar James I. McCord (quoted with approval by the Episcopalian bishop of Virginia Peter Lee) drew a distinction between them, teaching: "If you must make a choice between heresy and schism, always choose heresy. As a schismatic, you have torn and divided the body of Christ. Choose heresy every time."