This article gives an overview of the main findings of a report published by the Netherlands Institute for Social Research which describes how different Muslim groups experience and practice their religion, and what developments have taken place over time. A typology – based on a latent class analysis – is used to explore religious diversity among Muslims in the Netherlands. The study shows that religion plays an important role in the lives of virtually all Muslims. The way in which Muslims experience their religion is changing, but the direction of change is not uniform. There is a mild secularisation trend among the Turkish Dutch; the percentage who regard themselves as non-religious is small but has grown. This is not the case for the Moroccan Dutch, virtually all of whom identify as Muslim. At the same time, religiosity has increased among both Turkish and Moroccan Muslims