We could take it further:
- Non-Australians to work Australia Day.
- Republicans to work Queens Buirthday (bugger, that includes me).
- Those who vote for conservative parties to work Labour Day.
- Those who aren't servants to work Boxing Day.
Then we have the local stuff. If you are in Brisbane City Council we get a silly midweek holiday in August for the Brisbane show, but i normally don't go
EDIT: Actually, the more I think about it, as a non-religious person, it would be MORE offensive for me to work on Christmas Day as I would then be belittling the importance of the event for you.
So I have to take the day off. Sorry!