Defending Judaism / Redefining Christianity in Early Modern Europe

My book project addresses two types of toleration, legal and theological, as they defined Christian-Jewish relations in early modern Europe. My research asks two deeply connected questions: Could legal toleration have survived without the development of various types of religious defenses of Judaism? And to what extent did Christian defenses of Judaism, from the early sixteenth century to the Enlightenment, entail innovative conceptualizations of Christianity itself?