He was immortal, He could eat of the fruit of the tree of life, and this represents the Love of God, in fact God is love. There is a natural body, and there is a spiritual body. And as we have borne the image of the earthy, we shall also bear the image of the heavenly. The whole law was concerning this topic, Paul taught that he was preaching of Jesus and Him being crucified. Atonement is a ruling power.
Gospel is the plan given to mankind to be rescued.
The Gospel clearly explains that laws should be observed, but there is space for mercy when repentance is proven. Atonement represent for mankind as fall was, one man gave death to mankind, another one gave life, that is perfectly fair. Atonement is the ultimate power to purify, is the way in which mankind can have the mercy that fall didn't have, fall was just justice, and was for that reason that God introduce it. The only way to fix the broken law was. And men are instructed sufficiently that they know good from evil.