The great double-edged sword of the non-denominational/autonomous church is that final authority rests within each church. This allows for nimble changes in strategy but can hurt theology and lead to unorthodox beliefs and practices.
Me, my Bible, and the Holy Spirit sounds like a good – even spiritual – idea. But it’s a recipe for theological disaster. Good theology is never done in a historical vacuum. Paul reminded the Ephesians that the church is built on the foundation of the prophets and the apostles. When your beliefs radically depart from the past or have consistently been refuted throughout history, it’s time to go back to the foundation.