Thanksgiving is emphatically a religious holiday, but a non-exclusive one.
Most religions have rites through which they give thanks at least weekly, but Thanksgiving Day did not draw upon or rise up from any of them.
The ninety-percent who claim to believe in God pray to one they might call "Thee."
The non-religious can regard this as a lightly-imposed civil, national day. They don't have the "Thee" and "Thou" to be concerned about, but they know, with the formally religious, that "thanks-giving" is a way of life of generous people who regard all of life as a gift--and they respond.
When they do, they are saying "thank you," and when they are doing "thank you" they are being religious. Somehow. And somehow is the way Americans at large like to be religious.
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