Multicultural vs Mono-Cultural Congregation Retention

The homogeneous unit principle (HUP), popularised by Donald McGavran in 1970, predicted that churches grow fastest when composed of people from the same racial, linguistic, or class background. This principle has been both influential and controversial in church growth theory, with critics arguing it prioritises sociology over biblical mandates for unity. For Adventist congregations in multicultural Australia—where the church is "more multicultural than average Australians" (Avondale, 2024)—the question of whether diverse or homogeneous congregations retain members better is strategically critical. No Adventist-specific study has directly compared retention rates between multicultural and mono-cultural congregations. Broader church growth research shows mixed results: homogeneous churches may grow faster initially through lower social barriers, but multicultural churches that invest in intentional integration structures can achieve comparable or superior long-term retention. Key mediating factors include leadership diversity, language accessibility, cultural affirmation, and the quality of intercultural relationships. The Australian Adventist landscape—with its mix of Anglo-heritage, Pacific Islander, African, Asian, and Latin American congregations alongside intentionally multicultural churches—provides an ideal natural experiment, but the research has not been done.