THE QUESTION: Whatever happened to U.S. “Mainline” Protestantism over the past half-century? THE RELIGION GUY’S ANSWER: What’s known as “Mainline” Protestantism was pretty much America’s culture-defining faith till well after World War Two. Fifty years ago, these church groups still maintained high morale and together boasted at least 28 million members. But by the latest available statistics they’ve shrunk 45%, to 15.5 million. During those same decades, the U.S. population increased 61%. Across U.S. religious history, nothing like this has... Read more