More likely, it'll go down like this, if people try that: There will be complaints of Christians "interfering" with "Muslim worship". The city will then order the Christians to cease and desist from harassing the poor Muslims by trying to block the free expression of their religion.
Then, the city and/or the Muslims will go to court, and get a judgement -- a restraining order -- prohibiting the Christians from "interfering". If it continues, they will go back to the court, get the Christians to be "found in contempt" -- and be subject to fines, damages, and so forth.
If the Christians do not pay up, they'll go back to the courts again, and they'll get various writs, orders of execution, and so forth, so that they can file liens against the homes of the offending Christians, garnishee their bank accounts and paychecks, take their cars, and even march into their homes, accompanied by police officers, to walk out with anything of value, to sell off to "help satisfy the judgement".
They won't have to arrest a single person. But, they will be able to destroy countless lives and families.
Nice game, ain't it? Really cute.