the Turkish Empire occupied most of Eastern Europe for centuries. It came near to capturing Vienna,a feat which wold have opened the floodgates to Islam in Europeans did convert to Islam and have remained faithul to the religion despite decades of atheistic communist rule. It is not unthinkable that had the Muslims conquered Central Europe, Islam could today be the faith of many Europeans. to European Christains, whether nominal or prectising,this would have been a tragedy of horrendous proportions