Bobbtjoe
Emperor
Why do Atheists celebrate Christmas? There's not too much to add in the OP, so I'll post a smile. 

People like free stuff? IDK. The actual holiday has moved so far away from its original intent, that my church had a huge 'Put Christ back in Christmas' movement last year sort of funny when they had a movie with kindergardeners talking about how they integrate christ with christmas. You could so tell that they were reciting lines a being prompted.
This.Why do non-atheists commercialize it?
I'm unsure. Why do we celebrate a holiday filled with Christian traditions like exchanging gifts, putting up trees decorated with festive ornaments, bedecking our houses with tiny light bulbs filtered through colored lenses, swapping stories of a man in a red-suit with a magic sled, and quietly disposing of fruitcake?
I defy you to actually show the 'christian' origin of any of those items listed...
I don't know about that one![]()