Islam is the fastest growing religion in the UK, with the number of Muslims almost doubling in the last few years from 1.5 million in 2001 to 2.71 million in the latest census, 2011. A small but increasing number of people are also choosing to leave the religion and many say doing so has led them to be rejected by their family and friends and - in some cases - threatened with violence. Benjamin Zand spoke to ex-Muslims.
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