David interviews Adam about his upcoming book, The Turk at the Door: Luther, Islam, and the Fate of Christendom in the 16th Century, which is set to be released in one week. They discuss common questions about Islam that Adam receives during lectures, including questions about Islamic violence, the nature of true Islam, and the historical context of Islamic expansion. The conversation covers topics such as Muhammad's early life and military conquests, the concept of jihad, the role of the caliphate, and similarities between Islam and other restorationist religions like Mormonism. They also discussed how the Quran contains echoes of Christian and Jewish texts, and explored the challenges of translating Islamic texts.