Eh, they just need someone to open an (or a few) Islamic based school(s) somewhere where there is a reasonable Muslim population. As soon as they realize "religious freedom" is being used to send their tax money to support Islam or any other religion but theirs, they will rethink this.

Christians are all about religious freedom as long as the religion in question is theirs.

Government should not pay for ANY private schooling. Government should invest in quality education for EVERYONE.

This was decided a long time ago. We studied this in an education class when I was in college. Ironically, one of the cases that preceded the big one was from a city/state (forget the details) that feared the collapse of Catholic schools and the onerous burden that would befall the public system. The government wanted to pay the Catholic school teachers; the church fought against that fearing the government would push itself into their curriculum.
Maybe Maine needs to set rules for ALL schools mandatory curriculum, for schools taking government funds, if this shit passes.