You have a very odd understanding of what “secular state” means. It doesn’t mean that the state can dictate where or how you’re allowed to express you religion. It doesn’t mean that some parts of religion are to be tolerated, where as those that you see as bad can be forbidden at will.
All it means, is that the state institutions, can’t force you to partake in a religion or activities related to that religion. Kids who voluntarily want to express their religion are free to do so. Whether that kid is forced into following that religion, is not an issue of a “secular state”.