In this episode, Dr. Alan Strange explores the complex relationship between Christianity and Islam, examining whether the Islamic faith served as a "check" on defective Christian practice in the medieval era. He then dives into the Crusades - the series of religious wars waged by European Christians against Muslims in the medieval period, providing an overview of the reasons, motivations, and tremendous bloodshed that occurred. He then relates church/state entanglements of that era to the same tensions that still exist today, discussing how faith and politics can function properly.