I celebrate all!
I was born in a family which celebrated two christmases - one on Dec 25th, the other on Jan 7th, because my granny is orthodox christian. We still do.
Now at my work, there is a muslim who brings cakes for Bajrams - so I can say that I celebrate Bajram with him. Unfortunately, there are no jews where I work, because I'd probably celebrate their festivities also.
And I am not a religious man. I believe (which may sound contrary to the previous sentence) that all religions stand on the equal footing. I am happy for my friends that are religious and celebrate their religion in a nice and peaceful manner (for those that celebrate christmas by shooting AK47 into the air after midnight mass...let's say that Dante has thought of some places for them) in the air of love and understanding.
Happy holidays for all - christians, muslims, jews, atheists, agnostics, buddhists, hindi... I know I missed someone, but please do not be offended.
Branimir
P.S. As you can see, I still do not celebrate all. But am working on it