I'm pretty sure (though not 100%) that the religious classes are voluntary.

Or religious classes that are not part of school?

Children attend religious classes only if parents have given consent.

It won return of voluntary religious classes to the schools.

The school also requires every student to take religious classes.

Parents have been able to withdraw their children from the religious classes if they put the request in writing.

As a child she was forbidden from attending any religious classes at school by her father.

College age students between the ages of 18 and 30 are also encouraged to take religious classes known as "Institute".

Their 14-year-old brother had an after-school club meeting, ski team practice and religious class that night.

A general strike broke out after German became the required official language for religious classes.