NBCNews.com | Americans overestimate the percentage of Muslims in the US by 16 points, study says Sacramento Bee In France, which has suffered three mass terrorist attacks linked to Islamic terror groups since January 2015, the average guess for the percentage of the Muslim population was 31 percent, while the actual number is 7.5 percent. In Germany, where the ... Most Americans Overestimate Muslim Population by 17X, Poll Shows Americans think there are 17 times as many Muslims living in the US as there actually are Survey: Europeans Vastly Overestimate Local Muslim Populations |