This paper investigates Muslim politics in its wider social context in postcolonial Kenya, with a historical focus mainly on the Moi era (1978-2002). Hereby, I look at the introduction, integration, and internal constestation of Islamic reformist ideologies in Swahili discourse and in social practice. Central to my argument about the interconnections between Muslim politics, national politics, and coastal sociality is the notion of a ‘knowledge economy’, within the postcolonial setting of a ‘double-periphery’ in which Kenyan coastal Muslims are situated, vis-à-vis the state and the Muslim umma (community of believers). I discuss the dynamics between aspects of knowledge and rhetorics, reasoning and power, and ideology and social practice at work in this particular Muslim context. All of this is situated within national Kenyan politics, and discussed against the background of a postcolonial state governed by upcountry Christians with whom coastal Muslims have historically had a tense and antagonistic relationship.