At least 65 Christians have been killed in attacks across the Muslim world in recent months, sparking sharp criticism from human rights groups that charge the U.S. government and media aren’t doing nearly enough to speak out against the violence. A shooting in Egypt last month that killed a Christian man and injured five Christian women was just the latest in the series of attacks, several of which occurred around the holiday season: A New Year’s bombing at a Coptic Christian church in Alexandria, Egypt, killed 23 people and injured more than 100; Christmas Eve blasts in Nigeria killed at...