What is a Christian school?

When the term "Christian" school is used, then it is usually a school run by evangelical fundamentalists.

It seems that these people have succeeded in using "Christian" as a synonym for themselves, and for themselves only.

Just as if Catholics and Anglicans and Lutherans and Russian Orthodox believers were no Christians.

Is that so?

My point is: What is a CHRISTIAN school or the CHRISTIAN religion as opposed to NON-CHRISTIAN schools and NON-CHRISTIAN religions?
Are Anglican and Catholic and Lutheran and Greek Orthodox schools and religions etc etc Non-Christian schools and Non-Christian religions etc etc?
And are only evangelical fundamentalist schools etc etc real Christian schools etc etc?

Here is my thread on a US-forum:

https://debatepolitics.com/threads/what-...-school.443132/