But sin entered the picture and God, in His loving mercy, sent His Son into the world to save the world. Love is not a doctrine, it is an experience, an action. In the Garden of Eden, Adam and Eve walked with God. They actually walked with the creator of the universe. They had fellowship with Him.
Fellowship is an intimate communion between two or more persons.
Adam and Eve had this intimate communion with the Lord. But when they sinned that fellowship was broken. God then shed blood, by killing an animal to get the skins, and covered Adam and Eve. If Adam and Eve were walking with God in the Garden of Eden, but it wasn't the Father, then who was it. It must have been Jesus.