Turns out that some parents do require a mandatory license for parenting. A parent can end up before judge and be required to take a parenting course. These courses are all (as far as I can tell) evidence-based, developed and evaluated using sound science. Programs like: Incredible Years, Triple P, Kazdin Method.
Ironically, most parents, even those who read lots of parenting books, never encounter a parenting book that is primarily evidence-based. Most parenting books are opinion-based. The most recent evidence-based book that I know of is "Everyday Parenting" by Kazdin.
developed and evaluated using sound science.
I would like to point out that my BS detector started jerking rather alarmingly at those words...
Sir, Could I See Your Breeding License?
Most important is that children don't have to grow up under horrible circumstances inflicted on them by the inability of their parents. You always have to weigh the freedom of some against any negative infliction it could have on others. In this case a bit less freedom would guarantee a lot less distress.
It is reasonable. I don't see how we can ask for species-appropriate animal husbandry regarding animals like chimps but not children. You have to have a drivers license for good reasons too. So why is everyone allowed to rule over helpless human beings for years without having to prove their ability to do so in a way that guarantees the well-being of their protégé?
Such discussions always remind me about something important. Children should not be assigned with any religion. There should be a certain age where they can decide what religion they want to follow, if any. This doesn't mean that religious people shouldn't be able to have children but that they shouldn't be able to force their children into a certain framework either. Parents should be forced to allow their children to take part in a educational framework based on contemporary ethics and knowledge. I don't even have a problem with lessons in religion in school as it is part of human nature. But it shall not be focused on any truth value or a certain religion but an overview and comparison with non-religious ethics and truth-seeking.