This paper examines philanthropy as a moral infrastructure that allows practices and tools to move between secular and religious contexts. Based on ethnographic research with Protestant NGO networks in Brazil (meetings, public seminars, planning sessions, and intensive spiritual retreats), I argue that these organizations produce and maintain an ambiguous institutional identity, a specific organizational context in which different registers coexist, alternating between registers of public engagement and religious identity, maintaining a tension between them. This oscillation allows members, within this ambiguous context, where the meaning of practices depends on the socially recognized register in which they are interpreted, to explore the effectiveness and appropriateness of philanthropic mechanisms, organizational structures, and ethical frameworks in different domains. Furthermore, the study shows that some practices and tools fail to become fully established during the process. However, when practices and tools that are ethically problematic are evaluated, organizations can adjust, test, and refine both their tools and language, supporting ethical learning. By emphasizing this ambiguity as a productive force rather than simply residual effect, the study contributes to discussions on religion, morality, inequality, and public engagement, going beyond debates about how religious individuals and groups strategically adapt to secular institutions.