"George Bush has claimed he was on a mission from God when he launched the invasions of Afghanistan and Iraq, according to a senior Palestinian politician in an interview to be broadcast by the BBC later this month." This passage from Reinhold Niebuhr's work The Nature and Destiny of Man seems relevant:
Man is ignorant and involved in the limitations of a finite mind; but he pretends that he is not limited. He assumes that he can gradually transcend finite limitations until his mind becomes identical with universal mind. All of his intellectual and cultural pursuits, therefore, become infected with the sin of pride.
The Bible defines sin in both religious and moral terms. The religious dimension of sin is man's rebellion against God, his effort to usurp the place of God. The moral and social dimension of sin is injustice. The ego which falsely makes itself the center of existence in its pride inevitably subordinates other life to its will and thus does injustice to other life.