...it also raises the very important question of why children are opting out amongst the other children. Also, many schools are implementing ethics classes in place of religious instruction for the kids that choose to opt-out. No doubt there will be conversations in the school yard about the differences in the classes.
Nobody is missing out, it's just providing options.
These people have no right being in our schools, in fact, the right approach would be do ditch the biblical studies in favor of one ethics class where the children are presented with all kinds of examples of ethics...including religious ethics, and allow them to choose for themselves the path they want to take.
Make no mistake, it's the religion that creates the segregation, not the secularism.