MORE: http://publicreligion.org/research/2013/12/prri-rns-dec-2013-survey/
See also...
Do You Believe? Americans Less Likely to Believe in Historical Accuracy of Christmas Story Than a Decade Ago
http://www.huffingtonpost.com/robert-p-jones-phd/a-christmas-belief-myster_b_4455526.html
'Merry Christmas' or 'Happy Holidays'?
http://www.pewresearch.org/fact-tank/2013/12/12/merry-christmas-or-happy-holidays/
Fox News Busted For War On Christmas Hypocrisy