I am a teacher in an over-subscribed C of E school. If a student lives within catchment, there is a good chance that she will be eligible for a place. You would be expected to support the ethos of the school and depending on the school, she will have to take place in daily worship. However, different schools have different systems. Ours works on a points system for students living just outside catchment, with points being awarded for attendance at sunday school etc. You're best off checking to see what the entry policy is. We have plenty of non-church students but they are all expected to uphold the school ethos.