Then the Godless unions would have something else with whcih to attack Walmart. Not that I'm against your idea. I shop at Walmart whenever possible just to stick my finger in the eye of disorganized labor.
There are 800 attorneys ready to fight for your religious liberties for free. Check out:
http://www.alliancedefensefund.org/news/story.aspx?cid=3579
It is NOT against the law to say "Merry Christmas."