The problem here is that Adam and Eve were in the Garden of Eden, and in the end that’s ultimately not the preferred place to be.
How do you figure this when in Revelation, the elect are in the Garden with the Tree of Life & the nations using its leaves for healing?
Rev 2 KJV (BibleHub):
7 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.
Rev 22 KJV (BibleHub)::
1 And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.
2 In the midst of the street of it, and on either side of the river,
was there the tree of life, which bare twelve
manner of fruits,
and yielded her fruit every month: and the leaves of the tree
were for the healing of the nations.
3 And there shall be no more curse: but the throne of God and of the Lamb shall be in it; and his servants shall serve him:
4 And they shall see his face; and his name
shall be in their foreheads.
5 And there shall be no night there; and they need no candle, neither light of the sun; for the Lord God giveth them light: and they shall reign for ever and ever.
I believe that by the end of Revelation, the devil has been cast into the abyss & can no longer create trouble for man.
Also CS Lewis was not LDS, nor did he subscribe to their beliefs. I would say that his words do not mean what the LDS Church assume them to mean. His words must be taken in context.