Our spiritual beings?
You missed the point of Gen 3...
Gen 3:1 Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
Gen 3:2 And the woman said unto the serpent, We may eat of the fruit of the trees of the garden:
Gen 3:3 But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die.
God said they would die.
Gen 3:4 And the serpent said unto the woman, Ye shall not surely die:
The serpent (nachash - whispering enchanter) said "you won't die, you have an immortal soul"
God looked Adam squarely in the eye and said...
Gen 3:19 In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return.
He didn't say your body is dust, He said to Adam "You are dust".
Souls die...
Eze 18:4 Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sinneth, it shall die.
Eze 18:20 The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.