I came from a family that is so against proseletyzing and pushing religion that they won't even discuss relgion with anyone(and yes, they're Christians). On this basis I would have to say that schools of faith are a detriment to society. I was taught that education and religion should be exclusive from each other and they do not overlap, unless of course it is a class about religion. Teaching God along with physics and math only furthers the idea that religion is abolute truth and there is some factual basis behind it. If parents want their kids to be religious, they can take them to sunday school. They shouldn't dilute their education by mixing it with religion.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell