Genesis 3:10 KJV

And he said, I heard thy voice in the garden, and I was afraid, because I was naked; and I hid myself.

The world is naked before the eyes of God. Sin has abounded beyond measure, and what we think is ok, is not so ok to God. The Maker and Creator of the earth should have a say so as to what He feels is right and wrong. Here we find that Adam realizes that a major error has been committed and his eyes are now open to his imperfection. To cover his nakedness, they needed the death of an animal to appease the wrath of God. Now, Jesus has to come in and be the last sacrifice to cover the nakedness of the world, so that we can once again have a relationship with God.