pesky'apostrophe: always better than an unexpected period.
You go Mac!
Many years ago on the TV show Thirty Something one of the characters used the line "Happy Pagan Ritual", which is what I tend to use around my friends who know I am weird. I tend to respond with whatever people wish me - either Merry Christmas or Happy Holidays, whatever. Given I know a number of Jews, Wiccans and Christians what does it matter. Besides I know a number of people who still do trees & Santa regardless of their religion.