It's more like there's two Christmas' these days. There's the religious holiday, and the societal one. The religious one is still plenty alive and kicking, it's just not something you'll pick up on unless you, or a good amount of your family, are devout.
In another interest story related to this, there was a study done recently by a local university that said that obvious reminders of Christmas tended to stress out non Christians. When reached for commentary, the leader of a prominent local Buddhist Temple said "News to me" and asked the reporter if they wanted a shot of the temple's Christmas tree.
