The Garden of Eden is a myth, but the story was intended to convey a great truth. When you have everything and do not know that you have everything, you have nothing.
God is abundant, and so are you. In the Garden of Eden you had everything, but you did not know it. You experienced eternal life, but it did not matter. It did not impress you because you experienced nothing else.
The only way for you to know what it means to have everything is for you to at some point have less than everything. Hence, the Illusion of Insufficiency.
Your insufficiency was intended as a blessing, through which you could know and experience your true and total abundance. Yet it is necessary to step outside of the Illusion— to see the Illusion as an illusion, and move away from it—in order to have this experience.