Donald McGavran observed isolationist tendencies in the church and proposed both methodological consistency and sociological analysis as factors critical to evangelistic success. Later, church growth thinkers devolved into a syncretistic pragmatism that, over time, rendered the church as irrelevant as the church McGavran sought to combat. I synthesize various strands running through the history of the Church Growth Movement and isolate contributing factors to diversification through critical interaction with a contemporary of Donald McGavran—Lesslie Newbigin. Newbigin’s understanding of the relationships among gospel, church, and culture serves as the foundation for understanding how a church can slip into a position of either syncretism that overvalues culture or a position of irrelevance that undervalues culture
