<diacritize> In the conclusion of his book Christianity and the World Religions , theologian Hans Kung wrote : The most fanatical , the cruelest political struggles are those that have been colored , inspired , and legitimized by religion . <yor>In the conclusion of his book Christianity and the World Religions , theologian Hans Küng wrote : The most fanatical , the cruelest political struggles are those that have been colored , inspired , and legitimized by religion . 