Number of religious 'nones' has soared, but not number of atheists—social scientists want to know why

The number of individuals in the United States who do not identify as being part of any religion has grown dramatically in recent years, and "the nones" are now larger than any single religious group. According to the General Social Survey, religiously unaffiliated people represented only about 5% of the U.S. population in the 1970s. This percentage began to increase in the 1990s and is around 30% today.