New York Times best-selling author Robert Spencer investigates areas where Christians and Muslims fundamentally disagree. Do Christians and Muslims agree on the issue of abortion? Many Christians know they have some theological differences with Muslims, but still look at Islam as a valuable ally in a world increasingly threatened by secularism and immorality. Sure, we may not agree on every detail, they think, but isn’t it better to focus on what we have in common, so that we can fight moral and cultural battles together? This idea may be more popular than ever, but it is a “dangerous illusion,” says...