The largest single religious group among Democrats and Democratic-leaning voters is now the "religiously-unaffiliated," according to Pew's Religious Landscape Study.

More than one in four Democrats and Democratic leaners are unaffiliated religiously. Eight percent of Democrats identified as part of a non-Christian faith, compared to 3 percent of Republicans.

As a whole, the U.S. public is becoming less religious than in previous years. Seventy-seven percent of American adults are religiously affiliated, down from 83 percent in 2007. Eleven percent of the American public does not believe in God. Fifty-five percent of Americans pray daily, and only 50 percent of Americans now attend services at least monthly.

There is, however, a spiking share of people who feel a "spiritual peace and well-being" — 59 percent compared to 52 percent in 2007. Forty-six percent of Americans experience "wonder about the universe."

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