Islamic growth
Immigration and high birth rates means the number of Muslims in Europe has tripled in the past 30 years, making Islam the continent’s fastest growing religion. No one knows exactly how many Muslims call Europe home, since most European nations don’t track ethnicity or religious affiliation in census data. Guesses put the number around 20 million.
France accounts for the highest concentration in the European Union – 5-6 million, or about 8% of the population, says Religion Today.