Because without sin there should be life, which is Jesus our Savior.
We know Jesus exists. We know of his resurrection and the new life he gave us through that resurrection. We also know “All things were made through Him, and without Him nothing was made that was made. In Him was life, and the life was the light of men.” He is “the way, the truth and the life.” And “For in him we live and move and have our being.” Jesus is
“the image of the invisible God, the firstborn over all creation. For by Him all things were created that are in heaven and that are on earth, visible and invisible, whether thrones or dominions or principalities or powers. All things were created through Him and for Him. And He is before all things, and in Him all things consist. And He is the head of the body, the church, who is the beginning, the firstborn from the dead, that in all things He may have the preeminence.” Colossians 1:15-18.
We do not have life apart from our Savior. We do not have life apart from God. It is He who has made us alive, otherwise we were dead in our sin and trespasses. (Ephesians 2:1) In our sins, we are dead and our hearts grow dark: