Simon Calvert, of the Christian Institute, said: "Humanistic ideas already dominate the rest of the curriculum as it is. Why can't humanists leave RE alone? It's one of the subjects where students are encouraged to think positively about religion. Children don't have to learn about maths in history lessons, so why do they have to learn about atheism in religious education? Anne Heavey, of the Association of Teachers and Lecturers, said the Government needed to provide a swift response on the possible changes of the curriculum or it risked "chaos" in schools.