@ Tim & Mesh
Very interesting stuff guys, especially that link you posted Mesh.
As you know, I'm an atheist, but to me, Christmas has always been, and always will be, the day Christians celebrate the birth of their saviour, Jesus Christ. Christians should never feel obliged to 'prove' or 'justify' the date and its links to their faith.
What an awful world it would be where freedom to practise and celebrate one's religion was outlawed.
I'm often accused of being a hypocrite for 'participating' in all things Christmas, especially as I don't believe. But I like to think I do go along with the 'spirit' of the season, without at the same time requiring the religious element to do so.
Live and let live