A large part of the evolutionary purpose of religion is it provides a strong competitive advantage during tribal warfare, an extra confidence, focus, and purpose. Whether you believe or not, if you want a winning advantage at war, in business, politics, or sports, a leader with strong faith helps. During war, a commander in chief without strong faith is going to fold when the numbers show long odds.
At this particular juncture in world history, it appears that the Muslims have a major leg up on the Christians in that regard.....