This paper analyses prayer as an expression of intra-religious pluralism between Sunni and Shia traditions. Both currents of Islam share fundamental principles of faith, but differ in ritual practice, for example in sequences of movements, recitations and the use of material elements such as the call to prayer, prayer rugs, or the torbat (prayer earth for Shiites). These differences show the influence of theological and historical developments on religious practice. The materiality of religious objects and spaces not only functions as a supporting element, but also actively characterizes the diversity and dynamics within Islamic identities. The presentation will show how material dimensions of faith produce intra-religious differences and at the same time deepen the relationship between unity and diversity in Islam.