Another Ramadan is upon us, and no less an authority on Islam than Barack Hussein Obama has assured us that “for many, this month is an opportunity to focus on reflection and spiritual growth, forgiveness, patience and resilience, compassion for those less fortunate, and unity across communities.” Meanwhile, a Muslim whom Obama would disparage as a “violent extremist” who has hijacked the religion of peace, Islamic State spokesman Abu Mohammad al-Adnani, called on Muslims to use this Ramadan to “get prepared, be ready … to make it a month of calamity everywhere for nonbelievers…especially for the fighters and supporters of...