A strange take on church-state separation

First Things has the story:

A public school in California brings in a lesbian to speak to the students about her homosexuality. Parents, finding out about it after the fact, ask the school to reveal to them what was said. The school claims that it need not inform the parents as to what transpired in their children’s classes. Why? Because the speaker in question is a minister, hence her presentations at the school are confidential communications under the clergy-penitent privilege.

Interesting times.