It depends- in Christianity it is called Evangelism, but a secular term for it would be coercion. Christian missionaries are usually Evangelists, as they seek to convert people from following their existing religion into being Christians. Most world faiths other than Islam just dismiss Christian Evangelism as a disrespectful nuisance, but Islam sanctions the use of force, but ONLY as a last resort, to resist any attempts by priests or ministers from ANY other religion to convert them from the Muslim path.