I asked my TA to check this for me the next time she talked to her NCL contact. She e-mailed me today to say that her contact said there is a priest onboard for Mass on major holidays. I believe that Christmas would qualify as a major holiday!
Of course we can't be sure, but this is a good sign for those who are interested.
"A truly happy person is one who can enjoy the scenery on a detour."
Golden Princess 2009 Carnival Conquest 2010
Grand Princess 2010 Island Princess 2011
Grand Princess 2011 Carnival Magic 2012
Carnival Dream 2012 Island Princess 2013
Carnival Magic 2013 Carnival Legend 2014
Carnival Magic 2015 Coral Princess 2015
I personally don't think it matters at all as I believe it is all the same power no matter what you call him/her/it. Religions have much more in common than they differ. Either way, I think the message gets through.