Paganism...

Below is a documentary from 'Christmas Pagan holidays Exposed - The origins, myths and traditions of Christmas'.

The pagan festival of the invisible sun at the winter solstice is a European tribal tradition celebrated for the last ten thousand years at the shortest day and longest night of the year

Few people realize that the origins of a form of Christmas was pagan & celebrated in Europe long before anyone there had heard of 'Jesus Christ' (Yahushua).