Compulsion in Religion relies on extensive research with Ba’thist archives to investigate the roots of the religious insurgencies that erupted in Iraq following the American-led invasion in 2003. The Iraqi archival records demonstrate that by the 1990s, Saddam’s regime had developed institutions to control and monitor Iraq’s religious landscape. The regime’s ability to do so provided it with confidence to launch a national “Faith Campaign” and to inject religion into Iraqi politics in a controlled manner. Islam played a greater role in the regime’s symbols and Saddam Hussein’s statements in the 1990s than it had in earlier decades. This increase in religious rhetoric did not represent a shift from secular-nationalist ideology to Islamism, however. The regime’s official policies toward religious leaders and institutions remained remarkably consistent throughout the Ba’thist period; Saddam spoke derisively about all forms of Islamist politics in Iraq throughout his presidency. He promoted a Ba’thist interpretation of religion that subordinated it to Arab nationalism rather than depicting the religion as an independent or primary political identity. Saddam did so explicitly to undermine Islamists and the revolutionary religious movements that would emerge after 2003. When the American-led invasion of 2003 destroyed the regime’s authoritarian structures, it unhinged the forces that these structures were designed to contain, creating an atmosphere infused with politically instrumentalized religion but lacking the checks provided by the former regime. Sadrists, al-Qaida, and eventually the Islamic State emerged out of this context to unleash the insurgencies that have plagued post-2003 Iraq.