Dallas Willard

What you present as the gospel will determine what you present as discipleship. If you present as the gospel what is essentially a theory of the atonement, and you say, 'If you accept this theory of the atonement, your sins are forgiven, and when you die you will be received into heaven,' there is no basis for discipleship.

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning.