This article examines the use of religion by an authoritarian ruling party to delegitimize political opposition through securitization. The case study presented is the ruling AKP in Turkey, which initially promised to desecuritize the Kurdish issue to co-opt the Kurdish opposition but eventually resorted to the demonization narratives and repressive policies of the secular Turkish state; however, in addition to labeling the Kurdish opposition as terrorists, the AKP deployed religion to legitimize its repressive policies on religious grounds. The Turkish case shows that not in legitimizing (via desecuritization), but in delegitimizing opposition (via securitization) religion has been the main tool deployed by the ruling party. This finding needs to be tested in other contexts and cases. Additionally, since this paper only focuses on the narrative of the AKP’s religious delegitimization, further research is needed to measure its efficacy and impact.