after the Fall
This definition presumes one knows to what event "the Fall" refers. Autumn, perhaps? The end of the Roman Empire? Shirer's work? What in Adam's rib does "the Fall" mean?
By the way, lest you doubt the pretension of this erudite prig Simon Winchester: "postlapsarian" is not to be found even at AskOxford.com. (Infoplease.com defines it, as above, however).