"Lost" has come to its rather satisfying conclusion, and I'd like to assert a twist on the good/bad, Jack/Locke theme that has wound through the show's six seasons.
We heard for several seasons about the push and pull of science versus faith. Jack, the doctor, represented the former, of course; Locke, the healed cripple, the latter. The interweaving of Jacob and the Man in Black started to invert this, and the finale brings it all the way around:
Jack represents science-based faith, while Locke represents faith-based science.
The show's theme is not just science and faith against one another. It's about how theology can be shaped by exploration and fact, and vice versa. Strict interpretation of science does not succeed without an underlying belief. Strict adherence to ideas without investigation is destined to fail.
The recurrent declarations of "you were right" and "you were wrong" in the final episode underline this concept. Desmond releasing the water and light, proving Jack wrong? Part of the scientific method. The Man in Black becoming mortal? The triumph of curiosity over conviction.
A heavy spirituality of the show's final scenes shows how much a belief in faith guides "Lost." By coming full circle--showing that Locke's philosophical guideposts can indeed thrive, but only when grounded in process and understanding--"Lost" is unquestionably making a statement about the order of the world.
Audiences are slowly putting together the various loose ends in our minds, making peace with the questions we viewers are left to answer on our own. But a definite context now exists from which to consider the show's six seasons: the triumph of faith when based in science.