that is the same thing. just as illegal.
It could easily be asked in an innocent way.
Just enquiring into what the student did over the weekend.
You don't even have to mention the last line, and they could still draw conclusions and judge.
And if someone is just being genuinely interested in what you did over the weekend, whether friend or teacher, then it's harder to say Yes or No or say nothing at all.
Teachers shouldn't be judging at all on what your personal life is like, but they most certainly shouldn't be down-marking you upon it.
I would consider taking it to the principal/headmaster either way.
Even if he is christian himself he should have something to say about it as it is his job to, and he shouldn't let teachers pick on students because of their background.
And if he doesn't do anything then get in touch with the school board.
Make it perfectly clear how frustrated you are with it and mention how you've talked to the Principal/Headmaster and nothing has been done about it. They should most certainly discipline the Principal.
uh no you can't
You can report them to the school board though, who ought to discipline them.
At the most basic level, it is discrimination. Were he being discriminated against for being Black or Disabled or Muslim or his loveuality then there would be an uproar about it. It should be taken as seriously as any of those scenarios and so should all forms of discrimination, regardless of what it is over.