I believe we sin when we take our focus off God and all that he has done and continues to do in our life.
I believe that is how Adam and Eve “fell” in the garden of paradise. They took their focus off everything God had done for them when the serpent suggested God was holding out on them.
Their relationship with God was broken even before they took a bite of the forbidden fruit. They broke away from God the minute they entertained the idea that they needed and wanted something other than God’s provision for them.
Thankfully, God provided a way for our relationship to be restored with him through the finished work of His Son, Jesus the Christ. There can now be no doubt as to how much God loves us. He sacrificed his own son so that our relationship with Him could be restored.