No EP I am not living a lie.
I'm not the one who came up with the idea to call the winter solstise, christmas. Christmas is a generally accepted term in our culture and although I don't believe in any gods, I do believe in celebration of togetherness with friends and helping those less fortunate than I am when I can. It just so happens to be at christmas time that this particular helping opportunity comes around.
Just because someone is not a christian and helps the homless at christmas time doesn't mean they are living a lie. Besides lots of people who aren't christians celebrate christmas. Christmas isn't a christians only hoilday anymore, it is all over the world in non christrian countries and cultures. I personally know a muslim that celibrates christmas with his children because he doesn't want them to feel left out at school when they get back in January from christmas break. He does the whole tree, gift, and christmas dinner thing (minus the ham). He doesn't use santa or christian symbols in his celebration at all. He uses winter themed decorations, snowmen and snow flakes and pretty much anything that isn't tied to religion. I also know jewish people who do both christmas and hanukkah. They don't believe in a christ at all, not even a just a messenger of god like the muslims.