I think that under the state school system all schools should be non denominational. If parents want their children taught their religion of choice, then let them provide it, not the state.
Faith based schools just reinforce the percieved differences between cultures & religions not the similarities.
When I was at school (a long time ago) it was only when a few children were 'excused' assembly because they were Jewish or whatever, that I realised that they were 'different' from the rest of us.
Les