IMHO, there is no such thing as "radical" islam. European or moderate islam and islam are not the same things, because "european" or "moderate" islam aren't following the Qur'an and prophetic traditions as an exact instruction. They're following the madhhabs (i.e. doctrines) to avoid the danger of "misinterpretating", which in fact would be a precise interpretation.

https://www.youtube.com/watch?v=TcgwKneWp24

There are 6 madhhabs (i.e. doctrines) exist, fundamentalists are rejecting them.