This paper comparatively examines the ruling religious populist governments in Turkey and Pakistan through a theoretical framework that focuses on populists’ promises, their compromises, and their attacks on democratic institutions. Through our three-legged framework, we examine how these religious populists behave in power and how strategic necessities, the realities of governing, and structural constraints shape their policies. Similar to the other populists in other parts of the world, before coming to power, Islamist populists make sweeping promises to the people and quick fixes to major problems of the country—most famously, quick and substantial economic development. While they may want to retain their uncompromising style and lofty goals, the realities of governing force populists to make serious compromises to their designated ‘enemies’ and on their values once they are in power. Finally, like other authoritarian politicians, Islamist populists attack formal institutions of democracy such as the judiciary, the media, and civil society; they politicize them, evacuate them, and eventually capture them from within. Keywords: Religion, populism, Islamism, authoritarianism, populists in power, democratic backsliding, Turkey, Pakistan