And the tradition of bringing a tree indoors and decorating it. The 'Yule' log, mistletoe, holly, even the tradition of carol singers at the door (with changed lyrics) and exchanging gifts...
these are all pre Christian, pagan traditions at this time of year. The idea that Christmas (apart from the name) is 'Christian' is laughable.
I quiet like the idea tho of drunkenness, gluttony and debauchery...also,all pagan associations with this time of year and no doubt all still carried on today. You cant stop human nature from been what it is! ;-)