We see the word “religion” everywhere, yet do we understand what it means, and is there a consistent worldwide understanding? Who discovered religion and in what context? In A New Science, Guy Stroumsa offers an innovative and powerful argument that the comparative study of religion finds its origin in early modern Europe. The world in which this new category emerged was marked by three major historical and intellectual phenomena: the rise of European empires, that gave birth to ethnological curiosity; the Reformation, which permanently altered Christianity; and the invention of philology, a discipline that transformed Western intellectual thought. Against this complex historical backdrop, Stroumsa guides us through the lives and writings of the men who came to define the word “religion.” As Stroumsa boldly argues, the modern study of religion, a new science, was made possible through a dialectical process between Catholic and Protestant scholars. Ancient Israelite religion, Judaism, Christianity, Islam, Manichaeanism, Zoroastrianism, the sacred beliefs of the New World, and those of Greece, Rome, India, and China, composed the complex ground upon which “religion,” a most modern category, was discovered.

The passage of texts from scroll to codex created a revolution in the religious life of late antiquity. It played a decisive role in the Roman Empire’s conversion to Christianity and eventually enabled the worldwide spread of Christian faith. The Scriptural Universe of Ancient Christianity describes how canonical scripture was established and how scriptural interpretation replaced blood sacrifice as the central element of religious ritual. Perhaps more than any other cause, Guy G. Stroumsa argues, the codex converted the Roman Empire from paganism to Christianity.

The codex permitted a mode of religious transmission across vast geographical areas, as sacred texts and commentaries circulated in book translations within and beyond Roman borders. Although sacred books had existed in ancient societies, they were now invested with a new aura and a new role at the core of religious ceremony. Once the holy book became central to all aspects of religious experience, the floodgates were opened for Greek and Latin texts to be reimagined and repurposed as proto-Christian. Most early Christian theologians did not intend to erase Greek and Roman cultural traditions; they were content to selectively adopt the texts and traditions they deemed valuable and compatible with the new faith, such as Platonism. The new cultura christiana emerging in late antiquity would eventually become the backbone of European identity.