[Michael81Dus]

We have lots of private schools, most of them religious (protestant or catholic), but some are even private. These schools are all under the control of the state in order to guarantee a minimum level of education (i.e. a private school may not teach that 2+2=3), but also get financial support from the state.

[TalonDJ]

We have lots of private schools, most of them religious (protestant or catholic), but some are even private. These schools are all under the control of the state in order to guarantee a minimum level of education (i.e. a private school may not teach that 2+2=3), but also get financial support from the state.

From the article:
The judge had concluded that the children were well-educated, but accused the parents of failing to provide their children with an education in a public school. The court noted that one of the daughters expressed the same opinions as her father, showing they have not had the chance to develop "independent" personalities.

Clearly your courts don't thing educational standards are the only reason for governmental control. Apparently failing to let you children be exposed to adequate levels of state indoctrination is grounds for having your kids taken away.