The global public health community accepts antiretroviral therapy (ART) for controlling and managing HIV. However, within some communities, claims of faith or miraculous healing of HIV and AIDS by Pentecostal pastors continue to spark controversies. This paper reports on an exploratory qualitative study to explore the beliefs held by Pentecostal pastors regarding the use of ART among Pentecostal Christians who are living with HIV (PCLH). Twenty Pentecostal pastors from two informal settlements in Cape Town, South Africa, were purposefully selected. Open-ended, semi-structured, in-depth individual interviews were conducted on their religious beliefs concerning ART adherence. Interviews were conducted in English, audiotaped, and transcribed verbatim before being imported to the Atlas-ti 2023 software program for thematic data analysis. Since our study was guided by the relational community health system (CHS) model a hybrid deductive-inductive thematic analysis was used. Two contrasting themes about the influence of the religious beliefs of Pentecostal pastors were identified: The first theme and its associated subthemes highlight the lack of basic HIV and ART knowledge among pastors. Consequently, these pastors tend to nudge their Christians to rely more on faith and spiritual healing at the expense of adherence to ART. The second theme and the associated sub-themes suggest that some pastors possess some basic HIV knowledge and understand the role of ART and how it works. This group of pastors advise their congregants to use ART and other healthcare services in tandem with spiritual rituals, faith, and prayers. Our findings highlight the need for functional community-based structures, such as community health committees (CHCs) and health facility management committees (HFMCs), in settings where complex interaction within the belief systems, practices, and norms of some stakeholders can influence people's health-seeking behaviours such as adhering to chronic medications like ART.