This study investigates Religiosity and Plurality among Students and Lecturers at Islamic Religious Higher Education Institutions (PTKIN) in South Sulawesi, aiming to 1) assess their levels, 2) identify influencing factors, and 3) evaluate developmental effectiveness for both aspects. Employing a mixed-methods approach within a Religious and Cultural Education framework, the research utilized observations, interviews, questionnaires, and documentation for data collection, followed by a comprehensive data analysis process. Results from 77 respondents indicated high levels of religiosity (87.7%) and plurality (86%), signifying an excellent standing in both dimensions. Influential factors for these dimensions were the educational and community environments, highlighting that family, campus, and societal contexts play significant roles. It was noted that cooperation across different backgrounds is widely accepted, provided it does not conflict with personal beliefs. The study also found that the developmental patterns implemented at PTKIN in South Sulawesi are effective, enabling students and lecturers to appreciate and navigate religious, ethnic, cultural, and racial diversity successfully. Implications of the research emphasize the importance of understanding and practising religiosity and plurality within the PTKIN community in South Sulawesi. Such practices are essential for fostering a harmonious religious, national, and state life, aligning with Pancasila's values and the belief in the One Supreme God.