It is no fairy tale that the bible tells us these things. He planted a garden, and in days, it was grown. It is not possible in this physical world now. Any non atheist scientist out there must know this. To deny the world of spiritual experience, and the bible, only because we believe that only this physical existed, because we can see nothing else, is to confine oneself to the 'box' of physical only. Most people on earth have always known there is more.
Since it may be ignored, but not disproved, you may believe what you want. But don't try to lay some trip on me, where anything else but the puny physical only never existed, or ever will. No one argues that it now is all man has. It is real and great. But it is a small part of the big picture, and the spiritual is not subject to mere physical only tests, restrictions, principles, or laws.
The flood involved more than the physical, the garden did as well, and heaven will too. Trying to stick it all in the box is like trying to get the ocean in a spoon.