Nigeria's constitutional declaration as a secular state, enshrined in Section 10 of the 1999 Constitution, faces persistent challenges in practice amid the nation's deeply religious and pluralistic society. This article examines the complex intersection of church–state relations and secularism within Nigeria's democratic framework. The study adopts a qualitative research design grounded in doctrinal and socio-legal analysis. Primary sources include constitutional provisions, judicial pronouncements, electoral data, and policy documents relating to pilgrimage boards and religious commissions. Secondary data were obtained from scholarly journals, newspaper reports, and policy analyses published between 2015 and 2024. The research also employs content analysis of speeches by religious leaders and political actors during the 2023 electoral cycle. Data were analyzed thematically to identify patterns of religious influence on democratic governance and institutional practices. The findings reveal three major tensions. First, religious identity remains highly politicised, significantly influencing electoral alliances, voter mobilisation, and campaign rhetoric, particularly during the 2023 presidential election. Second, constitutional secularism is institutionally strained by the coexistence of federal secular provisions and state-level Sharia legal frameworks, creating legal and administrative ambiguities. Third, religious leaders increasingly function as both moral guardians and political influencers, blurring the boundaries between spiritual authority and partisan engagement. The study further finds that state-funded pilgrimages and government recognition of religious institutions subtly undermine the neutrality expected in a secular democracy. Consequently, Nigeria exhibits a hybrid model in which religion remains deeply embedded in governance structures despite constitutional secularism. The study concludes that Nigeria's democratic sustainability depends not merely on constitutional proclamations of secularism but on deliberate institutional reforms and normative clarity regarding the boundaries of religious and political authority. The study recommends a reconceptualization of Nigerian secularism not as hostility to religion, but as principled state neutrality that safeguards both religious freedom and democratic integrity.
Keywords: Secularism, Church-State Relations, Nigerian Democracy, Pluralism, Constitutionalism