@Smileyrius,
Ok so the idea is that there are 2 gods, one (God) good and creator of all things, and one (Satan) bad and rebel to his creator. These two guys fight for the control of the 1st guy's creation, I suppose, but with limited powers (like God cannot destroy Satan, and Satan can't just blow the earth into oblivion, or make devastating earthquakes happen; he has some connection with humans and acts ONLY through them, right?).
I'm supposed to play Satan... Let's see...
I'd support man's follies. His fears, his hatred, his ambition. I'd use them to pit man against man, nation against nation in war after war.
I'd use man's greed to destroy the earth.
This assuming that the good god has created greed, and fears, and hatred... Slightly odd when you think of it but nobody's perfect.... I'd use God's mistakes against his creation.