What is the culminating event, the point in time which becomes the axis of all other times?
It is the birth of a child. The point to which all times are moving is human, nameable. Here lies the source of order and meaning in human history, the origin and ultimate ground of all that is: Jesus, born of Mary.
John Webster, who died this year, reflects on the mystery of the Incarnation in this article from over thirty years ago, available from the Biblical Studies website.