Dame Louise Casey has prepared the report as part of the UK government's review into community cohesion and integration in some of the UK's most isolated communities.
Her review team has found that in some areas Muslims are completely cut off from the rest of Britain with their own housing estates, schools and television channels.
People from all-Muslim enclaves in northern England cities such as Bradford, Dewsbury and Blackburn seldom leave their areas and have almost no idea of life outside, The Sunday Times reported.
The actual figure, according to the 2011 census, is 4.8 per cent of the population in England and Wales. Christians account for 59.3 per cent.
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The report will criticise the UK Home Office, which current British Prime Minister Theresa May used to head as home secretary previously, and other departments for not doing enough to manage the pace and consequences of mass immigration.
The report comes as Sir Michael Wilshaw, the outgoing chief inspector of schools at Ofsted, warned that about 500 schools in England are either 100 per cent white or 100 per cent ethnic minority - and pupils in them are at risk of alienation and radicalisation.
Wilshaw told the newspaper that parallel communities were developing in Britain and children growing up in monocultural schools in these communities were in danger of being cut off from British values and vulnerable to either far-right or Islamist causes.