actually, if you read the Genesis account, there was only one cause of death in Eden…..disobedience to God’s command. The “tree of life” was also in the garden, guaranteeing that obedient ones could partake of it and “live forever”….not as an immortal in heaven, but in mortal flesh here in paradise on earth. Our bodies, though mortal can die, but there was no natural cause of death mentioned to Adam……in fact those closer to the original perfection with which Adam was created, lived for hundreds of years…..Methuselah live to be 969! Adam live to be 930….so sin was the only cause of death…..
What did God say after Adam’s sin?
Gen 3:22-24….
”The Lord God then said: “Here the man has become like one of us in knowing good and bad. Now in order that he may not put his hand out and take fruit also from the tree of life and eat and live forever,—” 23 With that Jehovah God expelled him from the garden of Eʹden to cultivate the ground from which he had been taken. 24 So he drove the man out, and he posted at the east of the garden of Eʹden the cherubs and the flaming blade of a sword that was turning continuously to guard the way to the tree of life.”