I asked my mother once why non-Christians celebrate Christmas. She said "Don't you think it's better that there be one day a year when everyone, regardless of their background, can come together and celebrate?"
I feel sorry for people who don't celebrate Christmas. It's like Thanksgiving, only with presents and a lot more decorations. For us, it's always been about family and friends and I think it should continue that way.
Even if the presents go away, I still love the decorations and the family get togethers.
And there is nothing quite like the look on a child's face when he gets up Christmas morning and finds presents under the tree.
My youngest, as you know is low functioning and when he was little, grandma would look at the wishbook with him trying to get him to tell us what he wanted. One day he pointed at a tin of popcorn and said "corn". So that Christmas, we bought him a big tin of popcorn. When he got up Christmas morning, he saw that tin, ran to it, opened it and stood there eating his popcorn. He wasn't interested in any of his other presents. It was funny. His older brother kept trying to get him to open his other presents, but no dice. He was just interested in that popcorn.