From the British Humanist Association:
The results of the 30th British Social Attitudes Survey (BSA) released last week show almost half of the population say that they do not belong to a religion. The increase in the non religious is almost entirely mirrored by a decline in the proportion of people who describe themselves as belonging to the Church of England, down from 40% in 1983 to just 20% now. Results show that religious identity in Britain has been in stark decline over the past three decades.
Religious identities in Britain have been in decline over the past three decades with this trend set to continue. This government has taken an aggressive stance regarding the role of religion in public life, and have claimed that Britain is still a Christian country, but we again urge the government to take note of these survey results and to recognise that almost half of the British population are in fact non-religious, and reflect this in its policies.
The 30th British Social Attitudes Survey: http://www.bsa-30.natcen.ac.uk/
The BHA’s page on statistics and surveys on religious belief: http://www.humanism.org.uk/campaigns/religion-and-belief-surveys-statistics
The British Humanist Association is the national charity working on behalf of non-religious people who seek to live ethical and fulfilling lives on the basis of reason and humanity. It promotes a secular state and equal treatment in law and policy of everyone, regardless of religion or belief.