I don't want to see ANY children opting in. The only way a child can opt in is by being persuaded. No-one should be persuading anyone else, especially children, that it's a great idea to live your life by fairytale.

I don't how to bring about these changes except by making the argument and the changing of mindsets. What I do know is that most people are not that bothered about religion, creating a sort of vacuum of complacency that religion cheerfully fills in order to bag the default position. It's dishonest in the extreme, just like most other aspects of religious faith.