Religion isn't truth, it should have absolutely no space in schools with the exeption of being a subject withing History classes.
that's what we do here. kids learn a bit of monotheist religions in history when they are about 11 years old. But that's very simple , just basic dates, and facts.. probably 5 hours in the whole year. That's mainly because we decided religion had nothing to do with public life, schools, state, government are all 'outside ' religion. So religion is only for your own private life and school is not there to teach you religion beliefs, if you need more info ,just ask the local church or whatever. Showing for instance a cross (as a pendant) around your neck outside of your clothes and you are expelled. (same stuff for any other religion).
Then they are private school for religious people.