We are talking about state-funded schools and in that case the state has discretion. Private schools may or may not accept students of other religious denominations. Parents sending their children to private schools have a choice. In the public school system, no such choice is provided, especially when we come to a point where the parents wish for their children to be segregated.
Wes Craven, director of 'Scream' and 'Nightmare on Elm Street', dies 76 (Haaretz)