Where is this found that the garden is not a real place?
You are a familiar with a parable, right? A story which is outwardly simple, but inwardly represents much more complex truths is a parable. An allegory performs the same kind of function--like Aesop's Fables.
Abdu'l Baha explains ONE meaning for the story and leave it up to us to find other meanings and look at all those meanings to understand it more clearly.
"Question. -- What is the truth of the story of Adam, and His eating of the fruit of the tree?
Answer. -- In the Bible it is written that God put Adam in the garden of Eden, to cultivate and take care of it, and said to Him: "Eat of every tree of the garden except the tree of good and evil, for if You eat of that, You will die."[1] Then it is said that God caused Adam to sleep, and He took one of His ribs and created woman in order that she might be His companion. After that it is said the serpent induced the woman to eat of the tree, saying: "God has forbidden you to eat of the tree in order that your eyes may not be opened, and that you may not know good from evil."[2] Then Eve ate from the tree and gave unto Adam, Who also ate; their eyes were opened, they found themselves naked, and they hid their bodies with leaves. In consequence of this act they received the reproaches of God. God said to Adam: "Hast Thou eaten of the forbidden tree?" Adam answered: "Eve tempted Me, and I did eat." God then reproved Eve; Eve said: "The serpent tempted me, and I did eat." For this the serpent was cursed, and enmity was put between the serpent and Eve, and between their descendants. And God said: "The man is become like unto Us, knowing good and evil, and perhaps He will eat of the tree of life and live forever." So God guarded the tree of life.[3]
[1 Cf. Gen. 2:16-17.]
[2 Cf. Gen. 3:5.]
[3 Cf. Gen. 3:11-15,22.] 123
If we take this story in its apparent meaning, according to the interpretation of the masses, it is indeed extraordinary. The intelligence cannot accept it, affirm it, or imagine it; for such arrangements, such details, such speeches and reproaches are far from being those of an intelligent man, how much less of the Divinity -- that Divinity Who has organized this infinite universe in the most perfect form, and its innumerable inhabitants with absolute system, strength and perfection.
We must reflect a little: if the literal meaning of this story were attributed to a wise man, certainly all would logically deny that this arrangement, this invention, could have emanated from an intelligent being. Therefore, this story of Adam and Eve who ate from the tree, and their expulsion from Paradise, must be thought of simply as a symbol. It contains divine mysteries and universal meanings, and it is capable of marvelous explanations. Only those who are initiated into mysteries, and those who are near the Court of the All-Powerful, are aware of these secrets. Hence these verses of the Bible have numerous meanings.
We will explain one of them, and we will say: Adam signifies the heavenly spirit of Adam, and Eve His human soul. For in some passages in the Holy Books where women are mentioned, they represent the soul of man. The tree of good and evil signifies the human world; for the spiritual and divine world is purely good and absolutely luminous, but in the human world light and darkness, good and evil, exist as opposite conditions.
The meaning of the serpent is attachment to the human world. This attachment of the spirit to the human world led the soul and spirit of Adam from the world of freedom to the world of bondage and caused Him to turn from the Kingdom of Unity to the human world. When the soul and spirit of Adam entered the human world, He came out from the paradise of freedom and fell into the world of bondage. From the height of purity and absolute goodness, He entered into the world of good and evil.
The tree of life is the highest degree of the world of existence: the position of the Word of God, and the supreme Manifestation. Therefore, that position has been preserved; and, at the appearance of the most noble supreme Manifestation, it became apparent and clear. For the position of Adam, with regard to the appearance and manifestation of the divine perfections, was in the embryonic condition; the position of Christ was the condition of maturity and the age of reason; and the rising of the Greatest Luminary [1] was the condition of the perfection of the essence and of the qualities. This is why in the supreme Paradise the tree of life is the expression for the center of absolutely pure sanctity -- that is to say, of the divine supreme Manifestation. From the days of Adam until the days of Christ, They spoke little of eternal life and the heavenly universal perfections. This tree of life was the position of the Reality of Christ; through His manifestation it was planted and adorned with everlasting fruits.
[1 Bahá'u'lláh.]
Now consider how far this meaning conforms to the reality. For the spirit and the soul of Adam, when they were attached to the human world, passed from the world of freedom into the world of bondage, and His descendants continued in bondage. This attachment of the soul and spirit to the human world, which is sin, was inherited by the descendants of Adam, and is the serpent which is always in the midst of, and at enmity with, the spirits and the descendants of Adam. That enmity continues and endures. For attachment to the world has become the cause of the bondage of spirits, and this bondage is identical with sin, which has been transmitted from Adam to His posterity. It is because of this attachment that men have been deprived of essential spirituality and exalted position."
(Abdu'l-Baha, Some Answered Questions, p. 122)
Regards,
Scott