I don't know if any of those ABers who are slagging off 'Faith Schools' have ever been in one, and I am talking about what was once called 'Church Schools'.
There seemed to be no trouble about these schools until the introduction into this country of Islamic Schools, which it seems is a completely different institution.
Many, many years ago my school life began in a Church of England School, we were taught traditional subjects just the same as any other state school, the only difference being instead of morning attendance, of hymns and prayers taking place in the school hall, as most other none church schools did, we were marched to our nearest church and they were carried out there.
Once back in school religion wasn't mentioned again until the 'Religious Education' lesson (the same in all schools at that time)
Incidentally in all English schools at that time, the Church of England faith was prominent and all other faiths stood out during the morning assembly.