How were Adam and Eve restored into fellowship with God?
Adam and Eve were restored into fellowship with God by faith. This restoration came by faith, not by human effort. The same pattern continued throughout Old Testament history: God provided the way back, and people were restored by believing. Their fellowship was restored on the basis of faith.
Les explains that God created Adam innocent, sinless, and perfect, but Adam fell. God then decreed that everyone coming from Adam would be a fallen creature, yet He did everything to bring that fallen creature back to his original state if they would just believe. Les emphasizes it has always been by faith. Adam was restored into fellowship by faith, and Eve was restored into fellowship by faith. The same was true all the way up through the Old Testament. This is not like Adam's sin: Christ superseded it. Through Jesus Christ, God reconciled the human race, paid the debt, and made everything possible to bring men back to Himself.