Sorry, I think I have not understood your first part. I replied to the comment saying that Christian nationalists want to only their religion being studied in school. And as I said it is ok that they are fighting for their interests and not others. Would it be Muslims, atheists or buddhists they also want to only their religion being studied in school, and it is also fine. But not only one group is deciding and influencing on a school program. And they do not make it.

Preaching in school is different because you are insisting a person to do the act of preaching. And my opinion there is no place for such a things in mainstream schools.

And yes, teaching a religion is when you learn the basics like you learning the basics of some philosophy, and reading the Bible like you will reading "War and Peace", not sermon.

Preaching and sermon is acceptable in private schools because parents are decide how they want their children educated.