This is a fundemental problem with the Judaeo/Christian creation story. This God who himself is said to be able to do no evil, creates beings who can.
Peacefulpete, you've got it. A perfect God cannot create beings that can "make themselves" imperfect, for a perfect creation would act perfectly in a impeccably perfect manner ALWAYS and NEVER make a mistake. That's perfection. How could the perfect Satan suddenly fail? How could a perfect Adam and Eve suddenly fail also? This whole damn tale doesn't make any sense from the very beginning.
I think we should go back to the good old days, gather all those bibles up and have ourselves a barbecue.