Question for my Social Media friends out there in cyberspace. If I do not celebrate Christmas does that make me in any way less of a Christian than I could be or should be?

Is Christmas a mandatory high holy day for the Christian? If so what Bible verses support this doctrine?

Does not celebrating Christmas make me any less a citizen of the world you live in or for that matter does it make me less of an American somehow?

As a Christian why should I celebrate Christmas? Please provide verses that I can use towards this end.