~*continued*~
if we look at this from a reasonable stance, not with religous values in mind things start to look normal in the bible.
if we look at it as god being the pilitical leader of an entire culture, and satan being the leader of a rival faction.
right now on the planet (lets just SAY the american govt. is right about 911, their not, but diff subject) we have 2 major factions ruling the power
over society ~*America*~ Vs. ~*middle east/Taliban*~
If America=God (Don't Take This Seriously, i'm canadian

)
and tiliban=satan
The taliban get proud Vs. america and rebel, factions around the planet choose sides,and war is waged.
"God" would realise that there ARE laws which CAN NOT be broken (unless ur a 4'th dementian object in a 3'rd dimentional space) such as, for every
action there is an equal and oppisite reaction (Karma) and so on.
with this in mind "God" would be forced to let "satan" live and wage no war against rivaling factions, he would be forced to let satan do what he
wish's OR Kick him off the planet and send him to ours.