ORIGINAL: Vabowman
In this case , I guess you could be fired for having a cross on your desk too, or a pic of Jesus or anything Christian... now, if it is Islamic or Hindu, or Zorastrian, or Buddhist, you will be fine, they don't offend people, it's only Christian ideology or philosophy that will get you.
Being christian myself it is easy to understand that this is merely because america is famous for trying to shove christianity down the throats of those who already had/have a religion.