This article examines religious hate speech as a discursive technology that constructs adversaries through conceptual antinomies, enabling moral disengagement and legitimising exclusion or violence. It draws on interdisciplinary perspectives from philosophy, law, sociology, and theology and discusses significant cases—including the Northern Ireland Troubles, ISIS propaganda, Hindu extremist rhetoric against Christians, and Buddhist ultranationalism against Rohingya Muslims—demonstrating how religious identities intersect with other factors to create hostile narratives. The article explores definitional challenges, distinguishes hate speech from incitement to genocide and blasphemy laws, and examines US and European legal approaches. It reveals that hate speech produces multilayered harms affecting individuals, targeted groups, and democratic processes, with causal factors including ideological antinomies, political manipulation, and social media amplification. The study argues that combating religious hate speech requires moving beyond punitive criminal law to embrace restorative justice, interfaith solidarity, counter-speech initiatives, and educational programs. Only through multifaceted collective efforts can societies preserve democratic values and protect vulnerable populations from discrimination and marginalization.