Just in case it isn't on purpose: it should be "Gesundheit!"

The absurd thing about people claiming that Christmas is "the reason for the season" and reminding us of the time of year's roots is that Christmas was in fact scheduled to correspond to previously existing Pagan festivals. No historical evidence demonstrates that Jesus was actually born in December, and this is apparent as well from a lack of consensus about the date (remember, Eastern Orthodox churches often celebrate Christmas in early January). Furthermore, there are even some Christian denominations who regard it as an invalid holiday (though, for the sake of full disclosure, these are the Jehovah's Witnesses and the Puritans.)

I also submit that saying "happy holidays" instead of "merry Christmas" is no different than saying "gesundheit" instead of "God bless you" when somebody sneezes. Is it really such a faux pas not to acknowledge someone's presumed religion with a common pleasantry that has nothing to do with it? No.