God walked in the garden in the cool of the day and called out to Adam for his whereabouts. Adam no longer walked in righteousness with the Lord because he had sinned and he was hiding. God knows every hair on our head and we cannot hide from him. When we sin we must confess it to the Father to walk once again with him.
Almost every man in the bible including some of the most Godly men fell from grace; Moses, David, Abraham, Noah, Solomon, right on down the list sinned in one way or another in their walk with the Lord. However, each one of them realized their wrong and asked God for his forgiveness and in doing so received it.
When we first decide to walk with the Lord