The journey begins in a French village at the base of the Pyrenees Mountains and ends in a Spanish village overlooking the Atlantic Ocean. In between is a path that millions of pilgrims have walked since the 12th century. In the spring of 2015, I was one of them, on sabbatical from my pastorate. The way is known as the Camino de Santiago de Compostela, a 500-mile path over the mountains and across northern Spain. Modern pilgrims...