The reasons that led a significant proportion of the French nobility to join the Protestant cause between the end of Henry II’s reign and the beginning of Charles IX’s reign remains a historical problem that has received little attention. The task is not an easy one, as the sources that may shed light on the confessional choices of the French protestant nobility are rare. However, there are exceptions, and more than one might imagine. This is the case with Antoine de Croÿ, Prince de Porcien, whose path, partially uncovered in the past, deserves a reexamination in light of the important role he played within the French Huguenot movement. The aim of this paper is to study in depth the motivations that stand behind his engagement with the reformation and the stages that spanned it. An analysis of published and unpublished sources seems to imply that, although the Prince de Porcien initially hesitated to publicly display his conversion to the Calvinist faith, he later unwaveringly embraced the fight for the Gospel, as soon as he perceived that battle to be the best way to find a balance between his faith and his standing in the society of his time. There is no doubt that, during his trajectory as a Huguenot leader, the Prince de Porcien searched for and received a series of benefits, starting with the marriage he secured with the daughter of a nobleman with a much higher rank than his, who, moreover, would later become an heiress. Nevertheless, far from pursuing social elevation purely to satisfy worldly passions, Porcien considered that the propitious situations that appeared throughout his life, and that spurred his ambitions, came from God. Yet, these propitious situations arranged by God happened to him during his confessional struggle—a sign that God recognized him and his coreligionists as His chosen people. Hence, we can explain Porcien’s lasting adherence to Calvinism and to the Huguenot movement, which only ended with his death in 1567. It must also be noted that kinship relations and material and religious interests coalesced to shape Porcien’s strong commitment to strengthen the Huguenot movement. This paper is particularly interested in how these patterns related to one another.