It is an instrumental dative: translate it "by means of" or "by reason of."
It explains the causal factor for the Fall of Humanity. If the cause were a
PERSON, it would have been genitive with hUPO, but as it is a THING, it is
in the dative (normally without a preposition, occasionally in Koine with
EN).
Carl W. Conrad
Department of Classics, Washington University
Summer: 1647 Grindstaff Road/Burnsville, NC 28714/(828) 675-4243
cwconrad@artsci.wustl.edu OR cconrad@yancey.main.nc.us
WWW: http://www.artsci.wustl.edu/~cwconrad/