Gosh people. Firstly, he did not mean christians. Even the buddhist/shinto japanese celebrate Christmas. The X-mas in Jazz is not religion based. It is about presents, santie-clawz hats, etc..
I'm a christian, and stopped celebrating christmas because of it's un-christian past. I now celebrate it for the same things that X-Mass Jazz games were made to celebrate.
The Jazz games are not religious. Hannukah is. I have nothing against Hannukah, but by making a multi-RELIGIOUS theme you would be bringing religion into it.

I'm not against making the multi-seasonal theme, in fact I wouldn't mind doing it at all. I was just gonna take a christmass-y Jazz pic and write JCF on it with some cool effects and maybe put MERRY X-MASS or something on it. Let's not over-complicate things, people.