New Hampshire court orders home-schooled child into government school. Not because she was receiving an inferior education - she tested above average

Hypothetical:

The couple down the street have ten children. They home school them all and on the surface seem to be reasonable people, both with high level degrees, and seem to really want the best education for their children.

The only catch is that they believe that their shared imaginary friend should be the guiding principle of their little ones lives.

We can call him Marco.

Now, there isn't anything wrong with belief in Marco. He's presented as a good guy over all. But the state feels that, since there is no actual proof that Marco exists (even though the parents credit him with having made everything and hold that out as proof, becoming irrationally angry when challenged on the subject...)the government feels that if may be a little improper for the ten kids to be given only that information and no other view of the world.

So, the question:

Should these people be allowed to teach their children only about Marco or not?

*Yes, the parallel is clear, but don't answer based on the idea that "Marco" could be exchanged for "God" "gods" or "Jesus" try to answer it only based on the idea that it's this couples imaginary and unprovable friend.

What do you say to that?

Should they have the "right" to teach them such things or not?

Ms Sadler thinks the christians stole her patented tribal mashiak