mes·si·a·nism 
(mĕsē-ə-nĭz′əm, mĭ-sī-)
(mĕsē-ə-nĭz′əm, mĭ-sī-)n.
1. Belief in a messiah.
2. Belief that a particular cause or movement is destined to triumph or save the world.
3. Zealous devotion to a leader, cause, or movement.
messi·a·nist n.