To understand the redemption you must understand Adam's sin, because the process will take place precisely in reverse of the process in which the exile took place. It's the removal of the foulness, therefore it's the reverse of the entire situation. Redemption is the final release and the final freeing of the world from the impurity. In the time of Adam before the sin there was no such thing as redemption because Adam was not in state of exile. The snake will only be removed completely at the end of the Messianic era. The World to Come is the finished state, where the world will be in a state of perfection.