Conservative Christianity fails in the same way modernism fails – it seeks an objective story to become the authority for everyone to read and comprehend.
Liberal Christianity fails in the same way postmodernism fails – it denies that there is an authoritative story to be told, and rather seeks a concept without a story, perhaps love, to be authority.
The only way to avoid these pitfalls is to subject ourselves to the grace of God by engaging in the practices of life that form the agent capable of reading and embodying the story that forms and is formed by the tradition over time that we call church.