Schools must teach pupils that Britain is a mainly Christian country and have "no obligation" to teach atheism, the Education Secretary has said.
Seeking to clarify a High Court ruling last month, which found the Government had unlawfully excluded non-religious views from the curriculum, Nicky Morgan said schools are still free to prioritise religious teachings.
New guidance from the Department for Education insists that non-religious beliefs need not be given "equal parity" with religious belief and that non-faith schools should reflect the fact that British religious traditions "are, in the main, Christian".
A recent case, brought by the British Humanist Association (BHA), sought to ensure that alternative world views were put before pupils in secondary schools.
Judges ruled last month that it had been wrong to suggest the content of the new Religious Studies (RS) GCSE could fulfil all of a school's religious education obligations.
Mrs Morgan is said to have been concerned that humanists were using the court ruling to pressure schools into giving non-religious views more prominence:
But BHA chief executive Andrew Copson said: "All the usual contemporary justifications for the teaching about religions in schools ... logically also apply to the teaching of humanism.
"The High Court ruling in this matter has implications for the school curriculum at all ages and further guidance is urgently needed to bring practice into line with the law."