"Religious war" is a general term for wars that have broken out with religious problems as the major cause. In the west, the Crusades, Hussiten kriege, and Reconquista that occurred before the modern times, and Schmalkaldischer krieg, Huguenot, the Dutch War of Independence and the Thirty Years' War that occurred in the modern times, are considered examples of religious wars. Under critical situations such as a social crisis, economic crisis, political crisis, or religious crisis, a religion is connected with nationalism and becomes transformed and develops into a protagonist of an exclusive ethnic or national conflict or a religious war. Herein lies the essential structure of religious war. Two theories are presented regarding the relation between religion and nationalism that would lead to religious war : an amalgamation theory, and a transformation theory. The amalgamation theory is applicable to some extent to consider the causes of religious war, but does not provide sufficient ground to explain the brutality of religious war. Therefore, the transformation theory is presented. In this theory, a world religion is transformed into an exclusive entity influenced by nationalism. In other words, the eschatology and the perceptions of humans in a world religion designate those who will be saved and those who will perish at the Last Judgment. This designation is transformed into an exclusive nationalism, and the sense of supremacy of one's own nation or ethnic group.
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