My entire family is atheist or agnostic and we have always called it Christmas. Our way of celebrating it is pretty traditional: get a tree, decorate it, and throw presents under it assuming we can afford them. We just don't pay any attention to the religious aspects of it because we don't care.
I think the nice thing about Christmas is with the commercialization of it, it's a holiday you don't have to be religious to enjoy, acknowledge, and partake in.
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