I've written about Christmas before. This post, in a way, summarises my thoughts towards it.
Christmas is celebrated on 25th December, right? It is thought that this date was chosen because a pagan festival to the sun was already celebrated on this day. Basically, Christianity subverted the festival that was already their and turned it into a Christian celebration of Jesus' incarnation.
Fast-forward a couple of thousand years. Christians now find themselves living in a culture which holds what is essentially a pagan festival on 25th December. And it needs subverting again, to turn it back into a celebration of the incarnation.
Specifics to follow sometime.