For science to lead one to God requires a genuine metaphysical agnosticism that is open to the revelation found in nature without presupposing any conclusion.

You are right that most scientists do not have this openness.  To be generous, it would seem most scientists do not admit metaphysical realities as an object of study.  If one assumes that which is eternal to be unknowable or inaccessible to the scientific method, then science will only serve to flesh out the boundaries of a sort of Kantian metaphysical agnosticism.