In 1909, the philosopher Arthur Drews unleashed a brief but furious debate when he published Die Christusmythe, in which he denied the historicity of Jesus Christ. This article seeks to understand the origin and significance of the “Christ Myth” controversy, focusing not simply on its scholarly content, but also on the historical contexts in which it unfolded, in particular the increasingly public and popular nature of theological debate in late Wilhelmine Germany. The article examines Drews's long-standing commitment to a monist religious philosophy inspired by his mentor Eduard von Hartmann, as well as his decision to intervene in the increasingly contentious debate around Protestant liberal theology's view of the “historical Jesus.” It also describes Drews's campaign to spread his views to a broader public through a series of lectures and debates, many of which were organized and promoted by the German Monist League. Although the actual theses of Die Christusmythe were not particularly original or well argued, the ensuing controversy placed Protestant liberal theology in a difficult position, which opponents were quick to exploit. While a wide range of Protestant theologians attempted to refute Drews, others moved away from a reliance on the historical Jesus. This shift was in part a response to intellectual difficulties in liberal theology that Drews helped expose, but it can also be seen as a reaction to the unseemly spectacle of university professors defending themselves against autodidacts and dilettantes, a situation that led some theologians to ground their positions on intellectual terrain less susceptible to such attacks.