Religiously unaffiliated people most strongly believe that empathy is a foundational moral value. Note that doesn't necessarily mean atheists; people who believe in God but don't associate with any particular religion would be in that group. In fact, I can't find any information about whether atheists are included in this survey, or if this was exclusively a survey of religious people.

Interesting (but not exactly surprising) results here. Makes me glad that "religiously unaffiliated" is the fastest growing religion in the U.S.

other discussions
 

With the exception of white evangelical Protestants (42%), around two-thirds or more of all major religious groups believe that empathy is a foundational moral value for a healthy society, including about eight in ten religiously unaffiliated Americans (83%), members of other non-Christian religions (80%), and Jewish Americans (77%). By contrast, a majority of white evangelical Protestants (54%) believe empathy can become dangerous when it leads people away from building a society guided by God’s truth.