In most European countries, violent radicalisation is usually understood as a consequence of religious radicalisation.
Consequently, policies for countering or preventing radicalism assume that the key is to regulate the practice of Islam, in particular, either by promoting moderate or liberal interpretations of it or by pushing for secularisation in order to reduce faith to the private sphere.
The issue I would like to raise here is not so much whether such a policy stigmatises Muslims, rather whether such a policy is relevant.