You asked
What is the size of the Muslim population in each major city in Kent.
We said
Thank you for your query asking for the size of the Muslim population in each major city in Kent.
Due to the regional detail you have requested the best data are from the 2011 Census, the full data are available from the Nomis web site and can be found here:
https://www.nomisweb.co.uk/census/2011/ks209ew
You have not specified a definition of a major city, but the Nomis data are sufficiently detailed to allow you to calculate different aggregations of the data. Alternatively Kent County council have already combined Census information by Local Authority, the result you can find here:
https://www.kent.gov.uk/__data/assets/excel_doc/0020/8570/Kent-population-by-religion-summary.xls
More recent information on religion can be found from the ONS Annual Population Survey.
Unfortunately, the sample size is not sufficient to provide reliable estimates of the Muslim population for low level geographies in Kent.