Well, let's go back and analyze Satan's original challenge a little more.
OK, although I dispute that it was Satan.
Here's what Genesis says:
3:2 The woman said to the serpent, "We may eat of the fruit from the trees of the orchard;
3:3 but concerning the fruit of the tree that is in the middle of the orchard God said, 'You must not eat from it, and you must not touch it or else you will die.'"
3:4 The serpent said to the woman, "Surely you will not die
3:5 for God knows that when you eat from it your eyes will open and you will be like divine beings who know good and evil."
So God told them that if they ate from the tree, they would die. The serpent told Eve that if she ate from the tree, she would be "like divine beings who know good and evil." Let's see what actually happened:
3:7 Then the eyes of both of them opened, and they knew they were naked; so they sewed fig leaves together and made coverings for themselves...
3:22 And the Lord God said, "Now that the man has become like one of us, knowing good and evil, he must not be allowed to stretch out his hand and take also from the tree of life and eat, and live forever."
From reading this, it appears that what the serpent told Eve was true, their eyes were opened and they became like god. They did not die from eating from the tree. They only died because God then banished them from the garden and denied them access to the tree of life. Who's the liar in this story?
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"The world is my country, all mankind are my brethren, and to do good is my religion." - Thomas Paine, The Age of Reason, 1794.