If the church doesn't care, send a letter to the mayor, show up to the town hall meetings or public town hall sessions, make videos about it on social media, sue them for being a noise nuisance, send the newspaper a message and describe your situation to ask for help in exposing the problem so that more people get wind of it, ... Basically, air your dirty laundry since the church doesn't give a fuck about you.
Personal opinion about loud, religious venues: fuck them. I wish more people would sue them for being a noise nuisance. If they want to remind people to show up, send an electronic message or hell, even a carrier pigeon for all I care, just stop making everybody aware of your beliefs. Many people don't care or believe in the same things as you. These aren't the 1800s anymore.