Shining Wit, I acknowledge the problem with Protestant and Catholic schools in NI.
In England we have a different situation.
Most faith schools are CofE or Catholic and we don not have a sectarian divide here.
They are in demand because their results are so good.
Fron CofE site,

Are Church of England schools socially divisive?
No, most church schools simply reflect the areas in which they are located. All CofE Voluntary Controlled schools (around 2,500) have 100 per cent local admissions, and fully reflect the community within which they are set. CofE Voluntary Aided schools (around 2,100) usually admit children of Church of England and other Christian families first, but the vast majority also admit local children including children from families of other faith traditions.