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.

At first glance, some might assume this means nearly 1 in 3 Americans are atheists, but that’s far from true. Indeed, only about 4% of U.S. adults identify as an atheist.

As sociologists who study religion in the U.S., we wanted to find out more about the gap between these percentages and why some individuals identify as an atheist while other unaffiliated individuals do not.

The religiously unaffiliated are a diverse group. Some still attend services, say that they are at least somewhat religious, and express some level of belief in God – although they tend to do these things at a lower rate than individuals who do identify with a religion.

There is even diversity in how religiously unaffiliated individuals identify themselves. When asked their religion on surveys, unaffiliated responses include “agnostic,” “no religion,” “nothing in particular,” “none” and so on.

Only about 17% of religiously unaffiliated people explicitly identify as “atheist” on surveys. For the most part, atheists more actively reject religion and religious concepts than other religiously unaffiliated individuals.

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