In the United States, we are experiencing the largest and fastest religious shift in the history of our country. Recent research shows about 15 percent of American adults — that’s 40 million people — have stopped going to church, and all of this, within the past 25 years. You might look at the data and assume that we’re headed for a non-religious, non-spiritual kind of culture in the next thirty years. But the religiously unaffiliated—the fastest-growing religious demographic in the United States—are often still religious in personal and privatized senses, only that their religious identities are in flux, mixing and matching various practices.