Islam is the second largest religion in the world, with 1.8 billion adherents who follow many different sects and traditions. One sect, Wahhabism, has grown tremendously in recent decades, in large part due to Saudi Arabia’s financial backing. Wahhabism’s message is one of intolerance—including towards practitioners of other interpretations of Islam—and this has inspired much of the global terrorism today, including the recent attacks in Sri Lanka, which were claimed by ISIS. In this episode, author Terence Ward discusses Saudi Arabia’s influence and Wahhabism’s impact. This is also the topic of his recent book The Wahhabi Code: How the Saudis Spread Extremism Globally.