Churches need to start ringing their bells before all services. Certainly the Episcopalians and continuing Anglicans can ring the changes, the Latins can ring the Angelus, Orthodox churches can follow the Russian bell-ringing tradition and everyone can ring bells to announce all services.
If there is objection to this, a suit on First Amendment grounds can be brought demanding either that the exception made for the Muslims be rescinded or that Christians receive equal treatment.