The terror is no new phenomenon in the human experience. More knowledge is needed about the ways of radicalization used by terroristic groups, with religion playing an important role. The article deals with doctrine, goals, and tactics for recruitment. The process of radicalization distinguishes four phases: the identification of targets, the indoctrination through the transfer of ideologies, the development of the identification with the guide, the person accepting this ideology by tolerating, encouraging and justifying its action, and its readiness to take over to action. The targeted person enters gradually into the ideology, which gets strengthened, promoted and upgraded up to frightening results. It overviews some activities to be undertaken to promote de-radicalization, as basis for the development of an Action Plan to implement such a strategy.