I agree in principal. What is the point of teaching a non-religious view? The sciences do this quite adequately. If people choose to follow the doctrines of religion, then teaching non-religion is not going to change their minds and it would be a waste of valuable educational time.
As an atheist, the biggest contribution to my views was my study of the Bible in all its 'glory', and now that I study all the mainstream religions it reinforces my views staunchly.
I do, however, disagree with Any religion bring taught in schools (with the exception of faith schools). No institution should be allowed to indoctrinate the innocent minds of the young.
To say that England is a predominantly Christian country is rather misleading. Church attendances are down, naming ceremonies are taking the place of baptisms.
Practising Christians are rare, thankfully.