People are free to hold stupid ideas, and they’re free to state those ideas in public, and the rest of us are free to jeer them for doing so… freedom of speech does not imply freedom from being laughed at and abused for holding on to such manifestly stupid ideas.
If someone believes in a powerful sky wizard who oversees all of humanity, they can teach their children of this magical being. They can even take them once a week to a place of education about this belief. IMO, it’s none of my or your business or right to be constantly present to present alternative points of view.
Personally I’d go further… teaching children that the world is flat should be considered criminal child abuse, as you’re intentionally impairing a child’s ability to function in any society, including your own echo chamber.
What I do object to is insisting that there is never a time when parents can teach their children arbitrary topic X without always having someone from the societal ministry of truth to be there to fact-check/align it.
There seems to be a significant power imbalance between the ministry and a parent.
A state of affairs that’s now pretty much been replicated, about a century after we first tried to learn the lesson that Fascism is a bad idea.
If you're answer to that question is, "no, because those children were abused by others lying about Santa, they will never be capable of overcoming that lie and will continue to propagate that lie" then it begs the question: what right does anyone have to tell anyone anything since all of us have experienced some sort of indoctrination at some point? Are we not all "broken" in that sense?
After all both opinions are or were popular so which one are we supposed to pick among the popular options?