I'm always amazed how everyone misreads this verse
“Of every tree of the garden you may freely eat; but of the tree of the knowledge of good and evil you shall not eat, for in the day that you eat of it you shall surely die.”
Metaphorically speaking, the Serpent (Lucifer), represents the divine force of creation that is able to carry out God's idea of creation. The Serpent sinks down to man's level and awakens the power of creation and the sexual energy in man (Kundalini). Thus, man can reach the knowledge which was previously only accessible to God.
In this Promethean light, we see a dishonest and manipulative god hoping to keep mankind in the dark about immortality and from becoming a god as well, and the Serpent bringing the fire to man against this god's wishes.
The Serpent showed Adam & Eve there are two paths they can follow:
Thy Will Be Done (RHP) or My Will Be Done (LHP)