I suppose you'd have no problem putting him in handcuffs and leading him away to jail for expressing his religious opinion in a place of which you personally disapprove?
It's worth noting that there are public colleges and universities for which the 9th's ruling could be extended if their false logic is allowed to spread ("teachers" can't say the Pledge in front of "Students").
Perhaps the 9th Circuit will be good enough to provide Americans with a list of approved and disaproved phrases that we may all use while on public property.
We wouldn't want to let "freedom of expression" get in the way of some good PC policing, after all...