I'm in favour of Religious Studies at all levels in all schools - optional in examination years, of course.
I would expect Christian countries to emphasise Christianity, Moslem countries to emphasise Islam, and so on. Faith schools would of course concentrate on their own particular faith, but I would expect them to teach a basic understanding of the other main religions at least.
Follwers of minority religions in any country would have to take whatever Religious Studies courses were on offer, and make their own arrangements regarding their own particular faith. But they should not be forced into acts of worship by the main faith
TYWD