Cons of having religion in schools?

A:For those parents who choose to send their children to a private, religious school, school prayers are an important part of the religious experience and education. The choice has been made to expose the child to religious training, and prayer is part of that training.

Those parents who choose to send their children to a public school have not elected to expose their children to religious training, and school prayers could be against their specific wishes. It is therefore potentially a violation of rights.