Britain, Spain and Holland will have an even higher proportion of Muslims in a shorter amount of time.
Last year, five per cent of the total population of the 27 EU countries was Muslim. But rising levels of immigration from Muslim countries and low birth rates among Europe's indigenous population mean that, by 2050, the figure will be 20 per cent, according to forecasts.
Data gathered from various sources indicate that Britain, Spain and Holland will have an even higher proportion of Muslims in a shorter amount of time.
The UK, which currently has 20 million fewer people than Germany, is also projected to be the EU's most populous country by 2060, with 77 million people.
The findings have led to allegations that policy-makers are failing to confront the widespread challenges of the "demographic time bomb".
Experts say that there has been a lack of debate on how the population changes will affect areas of life from education and housing to foreign policy and pensions.