The winter festival around the equinox is common to most religions, world wide.
We call it Christmas, other faiths have different names for the festival. If you are a practicing Christian, as I am, then I choose to send cards reflecting this to all my Christian friends. Some, the more artistic, will get sent to others, but I will happily buy winter festival themed cards as well for those of no religious faith.l.
If I wanted to send a card to someone of another faith. If card sending was not in their tradition I would send a winter card not a religious card and I would be delighted to get a card from a muslim, Jewish or Pagan friend celebrating the festival that they celebrate at this time of year.
onestepbeyond, you chose your name well,. You have gone more than one step beyond in the wording of your post and show a most unchristian intolerance to those who do not share your religious views.