I don’t know the law in France, but I’d worry it’ll cause religious parents to just keep their kids out of state school and do some form of private religious education, causing a greater divide. The best counter to these attitudes is exposure to diversity and other viewpoints. Maybe the kids going to school and seeing that there are other ways is better.
Of course. And if the parents dress them in that and keep them isolated the kids will pass that on to the next generation. If the kids go to school and see there are other options, maybe they’ll choose to be different when they’re independent or raise their kids differently. This is why cults always seek to isolate their members – exposure to diversity breaks the cycle.