Way to invite all the trolls to display other religious iconography in your schools, Louisiana. The Satanist Creed, The Pastafarian Recipe for Enlightenment, the Festivus Rules for Stating Grievances... all is fair now.
The real answer is to display all the other hundreds of Jewish laws in the classroom too, in the "spirit of the law". Have a class lesson on Jewish law and its interpretation. Send the kids home asking questions about why cheeseburgers are immoral.
These are the best kind of responses. The ones where I have heard so many stupid things coming from religion that I can't tell whether or not you're serious.