In current debates, Muslims are often perceived as a homogeneous group of devout persons who one and all have close relations with mosque associations and regularly, for purely religious reasons, turn to such associations. However, such notions clash with the reality. This paper contrasts such generalizing ascriptions with a differentiated image close to actual life. On the basis of a comprehensive mixed-methods study, the spectrum and differentiation of the ties of Muslims to constituted Islam, over and beyond ethnic boundaries, are described. The analysis focuses on everyday experiences, views and activities; it also examines the process-driven character and virtualization through the Internet of religious life. The findings of the present study point up the changes religious authorities are experiencing, and just how ambivalent and diverse the relations of Muslims to religious organizational structures are or can be.