The stark differences in God's persona between Old and New Testaments had changed his mind as to what to do with the world he created, and it's reasonable to think of him as a deity who is constantly changing, evolving. Otherwise we'd have a God who is static and incapable of changing; he'd be someone who'd be incapable of dealing with a continually unfolding cosmos which he put in motion in the first place. The Prime Mover, I'd think, must by definition be able to move again, and yet again, as needed, as his vast mind assesses, discerns and decides. Process Theology, put forth by Alfred North Whitehead and others, deals with a bit of this, as does Norman Mailer in most of his writings, most recently in his dialogue with Michael Lennon, On God.
It may be, after all we ponder about his Greatness, a mistake to think of God as omnipotent; if we are made in his likeness then our weaknesses are his as well, and this gives a vital clue that God is less than all-powerful and that he doesn't know the outcome of each and every matter before him. It's an attractive notion that God remains teachable by the very things he creates.
There's a reason that it's written that God blessed/cursed man with Free Will; I actually believe that FW is central to his Divinity, in the sense that he could choose to battle his creative power and simply do nothing. The existential nature of God, though, would become bored and ill-tempered simply existing in a vacuum, and so he decided to create meaning for himself, much as we do in this realm. Free will is that thing that allows us to associate together and determine and define right and wrong, good and evil, and it is also that inspire given instinct, I believe, to empower us to fight the baser desires and instincts