Tom, of course most if not all of Christmas traditions were borrowed from Pagans, but the main idea is that Jesus' birth is celebrated on December 25. Truthfully, we don't really know when Christ was born. The Christian church selected that day to coincide with the Pagan celebration of the Winter Solstice.
But still, Christmas to me is a time of giving and receving presents, being with family and friends, and feeling merriment. It should be a time of peace (unless your a soldier in Iraq ) and sharing.
I don't think it's a requirement that we all be religious to celebrate Christmas, but if you are or not, so be it.