I'm surprised the borg hasn't posited that Satan planted all of the malicious killings assigned to God, or that it was in fact Satan who killed the people and ascribed it to Jehovah.
Under this assumption it'd just be:
Everything good = Jehovah
Everything bad or that we don't particularly like because we're picky like that = Satan
Granted, they basically do this now, however you can reach some of them with the stoning commands and other barbaric practices found in the OT. However, if these acts were contributed to Satan instead, there'd be no recourse to rebut their beliefs. They'd be completely stuck in a God = Good, Satan = Bad cycle.