A study conducted by Michèle Tribalat (fr), a researcher at INED, and based on 1999 French census returns, showed that claims of 5 to 6 million Muslims in France were overestimated. According to the census returns, there are 3.7 million people of "possible Muslim faith" in France (6.3% of the total population of Metropolitan France in 1999)
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http://en.wikipedia.org/wiki/Islam_in_France