By now, the story has made the rounds. Back in June, Oklahoma’s superintendent for public instruction, Ryan Walters, ordered every classroom in the state to teach the Bible between fifth grade and high school. Three months later, when he released the guidelines for companies bidding to supply the Bibles, they included some unusually specific terms. The Bibles had to contain not just the King James Version of the Old and New Testaments, but founding documents like the Declaration of Independence and the Constitution, as well as the Pledge of Allegiance. And they had to be bound in leather, or some...