When Adam ate from the tree, he sinned. No buts about it, he sinned. He "missed the mark" and this has been the proclamation of the church ever since. HE SINNED!
Though that is true, I do not believe that is the supreme issue when it comes to our Father's heart! May I illustrate.
I also play the role of father, a role given to me from God Himself. When my children sin, when they miss the mark, that bothers me as a father. Of course it does! They sinned. They missed the mark.
But hear me please, that thought is not what dominates my heart. My heart is consumed with a much greater thought --- and that is not so much that they did wrong, but that they are going to have to suffer some ominous consequences because they did wrong. That is what grieves me... I NEVER want my children to experience what they were never designed to experience. Does that make sense?
Let's run with this then. When Adam sinned, of course that grieved the heart of God. But what grieved the heart of God even more is what man would have to experience because he did wrong. Now man is going to experience death. Now man is going to experience loss. Now he is going to experience fear, grief, sorrow, anxiety, guilt, shame, isolation, independence, and on an on we could go. All of these are going to occur because man was now divorced from God and now married to the law. A system of performing right and avoiding wrong in an effort to make himself "like God"... in an attempt to be "right" independent of God. Now man is going to experience guilt and shame when he does wrong, and he is going to experience pride when he does right.
This is what grieves God's heart. You do know that man was NEVER supposed to be concerned with doing right or now doing wrong. That mindset, that economy, only came in to the experience of man because Adam sinned by eating from that tree of right and wrong. Before this event, (this sin) man had no idea of right and wrong, good and evil was. All he knew was God, and that was enough. Sadly, ever since that fateful day, this has been the struggle of man. Not trusting that God is enough. Always laboring instead to do right and not do wrong in a feeble attempt to make himself "ok" independent of God.
Do you see why the sin of Adam (and any sin of man) grieves the heart of God so? It is not just that man has chosen wrong that sorrows God, but the fact that man is going to now experience the consequence of other than God. As a Father He wants so much for us as His children. He does not want us pursuing the "doing" of right and the "avoiding" of wrong. That economy is an economy that only came into our experience as a consequence of Adam's sin.... He wants us to experience Him as the only One Who can make us right, and express right, through us as we trust Him by faith. That is why throughout the New Testament He heralds loudly how He rescued us from the law through the Person and Work of Christ, so that we could once again be married to God!
What a Father we have. His great concern is not just that we have sinned, but that we have to experience consequences from that sin. And know this, His concern is so great that it led Him to send His Son, not only so that He could remove our sin, but also remove the consequences of sin. He delivered us from the code of ethics, the system of right and wrong, THE LAW, so that we could be restored to Him... WOW INDEED!