When Americans are asked to check a box indicating their religious affiliation, 28% now check “none.” A new study from Pew Research finds that the religiously unaffiliated is now the largest cohort in the U.S. They're more prevalent among American adults than Catholics (23%) or evangelical Protestants (24%). Researchers refer to this group as the "Nones."

Back in 2007, Nones made up just 16% of Americans, but Pew's new survey of more than 3,300 U.S. adults shows that number has now risen dramatically. Pew asked respondents what they believe. The research organization found that most Nones believe in God or another higher power, but very few attend any kind of religious service.

They aren't all anti-religious. Most Nones say religion does some harm, but many also think it does some good. Most have more positive views of science than those who are religiously affiliated; however, they reject the idea that science can explain everything.

Pew also asked respondents what they believe. While many people of faith say they rely on scripture, tradition, and the guidance of religious leaders to make moral decisions, Pew found that Nones say they're guided by logic or reason when making moral decisions. And huge numbers say the desire to avoid hurting other people factors prominently in how they think about right and wrong.

Demographically, Nones also stand out from the religiously affiliated:

• Nones are young. 69% are under the age of fifty.

• They're also less racially diverse. 63% of Nones are white.

• The Nones are comprised of three distinct groups – atheists, agnostics, and those who describe themselves as “nothing in particular.”