On the religious front, just as in those other arenas, the groups that favor Democrats are clearly growing. Not only have the religiously unaffiliated expanded since 2009 from about 1 in 6 to 1 in 4 adults, but the share of Americans who ascribe to non-Christian faiths, a group that also leans strongly Democratic, has edged up from 5% to 7% of the population over that time, Pew found. Simultaneously, white Christians have fallen as a share of all American adults -- from just over half in 2009, according to Pew and other data, to around two-fifths today.