Roughly one in six people around the world has no religious affiliation, a new study by the Pew Research Center’s Forum on Religion & Public Life found, making the unaffiliated the third-largest religious group worldwide, behind Christians and Muslims, and about equal in size to the world’s Catholic population.

The religiously unaffiliated population includes atheists, agnostics and people who do not identify with any particular religion in surveys, the study issued Tuesday reads. Many of the religiously unaffiliated, however, hold religious or spiritual beliefs, the study emphasized.

“For example, belief in God or a higher power is shared by 7 percent of Chinese unaffiliated adults, 30 percent of French unaffiliated adults and 68 percent of unaffiliated U.S. adults,” it read.

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