At the turn of the twentieth century, an enchanted response to Christianity among minority peoples on China's ethnic frontiers in Southeast Asia caught Western missionaries by surprise. This paper explores the historical circumstances and the dynamics of the mass Christian conversion among those hill peoples. Far from a cultural defeat and a grudging surrender to a conquering foreign faith, their embrace of Christianity was an exuberant, communal rush toward fulfillment of indigenous prophecies of redemption. Unlike the civilizing project of the modern state—a coercive mandate of assimilation and ideological transformation—the Christian movement offered them a choice and allowed them to channel their desperate prophecies of the past toward a reformist messianism. With its war on local shamanism, rituals of courtship, and inherited (and often inebriated) rhythms of ethnic life, Christian conversion was ostensibly a break with indigenous traditions. However, it also ironically fortified the ethnic identities of the peripheral peoples—especially through the creation of the written script for the purpose of Bible translation—and generated fresh resiliency for their material and cultural survival.