Almost all religions provide opportunities for human beings to convince themselves of their own righteousness, to speak in the name of God, and even to go to war on God's behalf. This 'blasphemy of certainty' is also rife among secularists who in their case have not God but science or the proletariat on their side.
Stephen R. Prothero, God Is Not One: The Eight Rival Religions That Run the World--and Why Their Differences Matter
atheism, holy-war, religion