Francis Fukuyama discussing Samuel Huntington

Indeed, if we unpack the psychology of identity, we see that much of what is labeled religious extremism is actually not driven by religious belief per se, if by that one means personal piety and individual commitment to a particular doctrine. Many of the young European Muslims who left the countries of their birth to fight for the Islamic State in Syria were trapped between two cultures, the traditional one defined by the piety of their parents, and the secular Western one in which they were brought up. This identity confusion could easily be answered by a radical Islamist who presented an ideology that answered the question, “Who am I?”, and connected that individual to a larger community of Muslims around the world.
In a less violent manner, many of the Muslim women who have taken to wearing the hijab are doing so not because they have suddenly become so much more pious; the hijab rather is a marker of identity that tells those around them that they are proud and unafraid to be seen as Muslim. 

From an article entitled 'Huntington’s Legacy' arguing that identity politics is a more important fact in the world than traditional cultures.