No. No..........................................................

Can I sue the hospital for defamation & slander of character? Not successfully IMO.

If you are an adult, and can find a lawyer to take your case, and can afford it, yes you can sue them.

There is nothing improper or illegal about what they did.

Lawsuits are expensive and time consuming. It will likely cost much more to sue than to take the classes.

This is a Q&A forum. What is your question?

Whether it is "alright" or not, it is not a legal issue.

Yes a Christian school can require this...................................

Lawyers here cannot reach out to you. Use the Find a Lawyer tab above.

Can they do that? They did that. That would seem to answer the question. Completely legal.