Religion is on the wane in America--at least that's the most recent wisdom. It's something of a surprising claim, however, considering the United States has long been thought of as one of the most pious of the world's developed nations. But in the past decade or so, a number of credible surveys and studies have concluded that our devotion is slipping. Religious affiliation--across nearly all faiths--is down. Americans aren't going to church or synagogue or prayer services like they once did. And our belief in God is diminishing as baby boomers die and the millennials come of age.