No no no, you're all not thinking like God.
See, if Adam had made it to the tree and eaten, then his sins would have been forgiven right? Presumably by the tree. But you see, God couldn't have that. He'd said Adam was going to die, and He can't change his mind even though He's God and can give the universe's biggest titty twist to anyone who objects.
So instead, it was much better for there to be thousands of years of death, war, rapine and butchery so that man really really got to think about how much of a screw up the whole eating-the-tasty-looking-fruit-that-just-happens-to-be-growing-around thing was. Then of course, it's a snip for God to send his own Son to Earth to wander around the desert like a looney for three years and then get nailed to a tree. This obviously means that God just might decide to forgive someone and not be accused of changing His mind.
Course, you need another few thousand years of war, rapine etc etc for everyone to figure that out. Then along comes God's Son, who's obviously pretty pissed with having hands that disqualify him from games of hide and seek, and he kills just about everyone because God has decided that He really can't be arsed to forgive them after all.
It all makes perfect sense when you think like God.
Expatbrit