The Serpent refutes God's claims about the Tree of Knowledge. Eve and Adam believe the Serpent and eat the Tree's fruit. The Serpent's claims seem to be accurate; they don't die, and "their eyes are opened".Genesis 3:2-7 wrote: And the woman said unto the serpent, We may eat of the fruit of the trees of the garden:
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.
And the serpent said unto the woman, Ye shall not surely die:
For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil.
And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
And the eyes of them both were opened, and they knew that they were naked; and they sewed fig leaves together, and made themselves aprons.
According to this passage, even God recognizes that Adam and Eve now know the difference between good and evil. God decides to make sure that they don't acquire eternal life as well, so he expels them from the Garden before they can eat fruit from the Tree of Life.Genesis 3:22-23 wrote: And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
I can see at least two Biblical truths emerging from these passages.
1) God knows good and evil, but he does not define good and evil.
2) Man also knows good and evil as a result of eating the fruit of the Tree of Knowledge.
So the book of Genesis does not support the assertion that God is the source of all morality, nor does it support the claim that humans cannot define morality without God.