I recently mentioned that I disapprove of going into churches with the intent of stealing Jesus' cracker-bound form. I wanted to clarify that the reason I disapprove is not out of respect for the ritual or the cracker itself, but out of politeness. Simply, you don't crash a party just because you can.
However, if they were handing out Nabisco Nazarene Nibblets on the streets, there'd be nothing wrong with tossing it in the trash. Personally, I'd probably try to feed it to birds so they become attracted to the spot and drive off the missionaries, but trash is acceptable.
That said, sometimes a group needs to be intentionally offended. This is sometimes the only recourse to force someone to either amend their beliefs to cope with society or appear and feel completely absurd. As has been said, sometimes the only effective response is ridicule.
So perhaps, in this case, a little Grand Theft Deity is called for.
In this debacle, I've noticed a huge number of Catholics and other Christians claiming that we wouldn't dare mock Muslims so openly for fear of violence. I fail to see what that red herring has to do with what's going on currently, but I suppose I can spare a bloodhound for that as well:
Okay, get offended.