Can God Learn?

The Old Testament seems to paint God as very human-like: he gets mad at people, overreacts and wipes them out, regrets it, makes new promises, acts surprised when his people stray again, punishes them again, makes bets with the devil to try to tempt one of his righteous dudes, and can get talked out of following through on his plan by a mere mortal. Oh, and demands total unquestioning obedience and worship. In short, the OT paints a picture of an insecure, manic-depressive, egomaniacal, and definitely not omniscient deity (after all, how could he be surprised or angry if he knew all along that that stuff would happen?).

Painted in that light, God seems to be a deity who, over time, seems to adjust his approach to us...and perhaps finally realizing that he might attract more bees with honey than vinegar, he sends us gentle, humble Jesus, full of love and hope.

This view of God flies in the face of what I learned growing up: which is that God is omnipotent, omniscient, perfectly just, perfectly loving, and most importantly, he never, ever changes (and thus I can trust him!).

But what if God does exist but isn't omniscient/omnipotent/just/loving/unchanging after all? What if he is tempermental? What if he is unpredictable? What if he holds grudges? What if he overreacts at times? What if he is powerless to intervene at times? What if God is on a journey of learning how to relate to us, as much as we are on a journey of learning how to relate to him?

The question that springs to my mind is this: is this a God worth knowing, following, worshiping? What makes a deity worth knowing, following, and worshiping in the first place?