I absolutely love Christmas and I am an atheist.
Some of my happiest childhood memories are around Christmastime because I was together with my whole family who I love very much (and some of whom are unfortunately now gone).
I know people say Christmas is too commercialized but I love having an excuse to buy things for the people I love. It's so nice to buy something and know that my daughter is going to light up when she sees it.
I also love being able to do Santa again now that I have a young child. The sense of imagination and magic is so refreshing and heartwarming.
I love the lights and decorations, they brighten up an otherwise kind of dreary time of year.
Christmas is different for everyone. Just because my celebrations don't involve Jesus doesn't mean that they're devoid of importance or love.
I know plenty of people who celebrate Christmas for what you would probably consider to be the 'right' reason (birth of Christ), but I don't think celebrating Christmas for any other reason is 'wrong' as long as it comes from a good, happy place.