Fall of Man and Ascent of Man

According to Augustine, the events of Genesis:2-3 constitute a 'fall' from Edenic immortality, to the need for sexual reproduction in order for humanity to continue to exist. Hence, this interpretation entails two propositions--1. Existence in Eden is sexless and deathless, and 2. The fundamental purpose of reproduction is continuation in existence. Now, while #1 seems unverifiable, it is, as is, incoherent in one respect--sexless Adam and Eve just happen to have been created with complementary reproductive organs. But, the greater weakness of the interpretation is #2, the principle of continuation of which is challenged by the principle of ascent, as proposed by Evolutionary theory. So, though Darwin and others compromise that innovative principle by subordinating it to a 'survival' instinct, two challenges to the Augustinian tradition remain--1. Adam/Eve is not an immutable human type, and 2. The transition to reproductive activity might constitute an ascent, not a fall.