"Turkey. Turkey is currently discussing entry procedures with the European Union (EU) that could allow it to join the EU in 10 to 15 years. This would increase the Muslim population in Europe by some 70 million. Some experts hope traditionally secular Turks, who have strictly enforced the separation of mosque and state in their own country, will temper Islamic radicalism on the European continent. Others say the addition of so many more Muslims will push Europe toward increasing religious radicalization."
More:Q&A: Islam and Europe - New York Times