Rising numbers of religious extremism are an increasing concern in Western Europe. As Western Europe is secular, and secular ideology seeks to diminish the influence of religion on society, this...Show moreRising numbers of religious extremism are an increasing concern in Western Europe. As Western Europe is secular, and secular ideology seeks to diminish the influence of religion on society, this rise is peculiar. It raises the question why religious extremism is on the rise in Western Europe despite its secular environment. Evidence suggests there is a causal link between religious extremism and secularism. Therefore, the purpose of this study is to investigate such a causal relation between secularism and religious extremism in Western Europe. To rule out other explanations, this study identified two rival explanations: A cultural disconnect and geopolitical factors. The validity of all three explanations was tested through a case study analysis of France, the Netherlands and Belgium. The results concluded that the cultural disconnect and the geopolitical explanation are not correct. However, the study concluded that certain forms of secularism lead to a rise of religious extremism in Western Europe. The cases demonstrate the mechanism behind this: States enforce disproportionately strict secular policies through a strict separation between the public sphere and the private sphere, and a positive bias towards the pre-existing dominant religion. These two factors trigger reactive religiosity, leading to religious extremism. Conclusively, disproportionate secularism plays a pivotal role in the rise of religious extremism in Western Europe.Show less