When a religion is doing the work of evangelizing, equipping and empowering its followers in the tenets of said religion, and it gets to place where it needs help from a civil power, then Ben Franklin would have a point I would agree with.  If a religion is going about the business of teaching math, reading and science and is not evangelizing, equipping and empowering children, but is giving them an education on par with any school, public or private, then getting help from a civil power is not a sign of being a bad religion.  Education minus indoctrination is just education.  Some Christian parents see evidence that their students a receiving indoctrination on the religion of the left, especially when there child is being taught false doctrine, such as the idea there are more than two genders.