I always stay away from religious themed quilts for any fund raisers. That way all people can enjoy them and maybe buy a chance or bid.
And yes christmas is a religous theme, so is Easter.
If it is for a fund raiser you want the most ammount of people to participate. I would be much more inclined to buy tickets for a general all purpose quilt rather than one that has a relgious theme and only useful at certain times of the year.
peace