Excerpt:
Members of the public in European states including France, Belgium, Germany and the UK greatly overestimate their country's Muslim population and the rate at which it is growing.
An Ipsos Mori survey that measured the gap between public perception and reality in 40 countries in 2016 found French respondents were by far the most likely to overstate their country's current and projected Muslim population.
The average French estimate was that 31% of the population was Muslim – almost one in three residents. According to Pew Research, France's Muslim population actually stood at 7.5% in 2010, or one in 13 people.