I mainly view it as family time, and time to spend with people that you love, etc. So mainly, it's a time for the celebration of family and love to me.

My family is religious, but I'm more of a rogue or maverick (I guess would be the terms?) when it comes to religion, so, even though I see it as the birth of Jesus, I don't go overboard and celebrate it too much.
As for the reason? Well, the reason would go more into my practicing and views on religion, so just know that I am not very religious, but enjoy studying the many religions and forming my own beliefs, rather than just sticking to one, for various reasons.