A meditation on Christmas by John Shelby Spong
My deepest self-definition is that I am a Christian, by which I mean that in Jesus of Nazareth I believe I see the meaning of God most clearly. This experience of an in-breaking divine presence is what I believe created the Christmas traditions that you refer to in your question. Certainly during this season they are omnipresent.
It was more than two thousand years ago that the historic figure we call Jesus lived.