Fides et ratio, or “faith and reason,” was the penultimate encyclical of Pope John Paul II. He argued that faith and reason do—and must—go hand in hand. Doubtless, among those who would agree with this principle are the Montana parents who sued in Espinoza v. Montana Dept. of Revenue to send their children to parochial schools after winning tax-credit-funded scholarships. At first, the parents lost; the Montana Supreme Court invalidated the entire scholarship program. Last week, however, the U.S. Supreme Court reversed that decision by a 5:4 vote, concluding that it violates the Free Exercise Clause of the First Amendment to strike down the program under a version of the Blaine Amendment in the Montana state constitution. Here’s my analysis.