Among Democrats and Democratic-leaners, religiously unaffiliated people (including atheists and agnostics, for example) make up the largest share, at nearly one-third of those people. That's a profound shift from 20 years ago; those "religious nones" are the fastest-growing religious group in America, and they are concentrated far more among Democrats than Republicans.
Long story short: The right is very, very Christian, while the left is much less so. That Republican group is 83 percent Christian. For Democrats, it's 59 percent.
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