I read Genesis as a rather simplified version of the process of God's Creation. The full account of the 13.7 Billion (give or take an eon) years of the Universe would have been a little overwhelming for a late Stone Age - early Bronze Age people. (One observes it is somewhat overwhelming for Computer Age folks.) Nor is that full account needed to understand the Universe is God's Creation on all levels, or to grasp the relationship of God and mankind.
I've got no problem with saying Genesis is a simplified version of God's creative process - that we wouldn't understand if He told us everything.
But I do disagree that we're smarter than Stone Age/Bronze Age peoples. What they did was VERY impressive given the starting point. The idea of Grug beating one rock against another out of childish pleasure, accidentally cutting himself when it fractured, and going, "Ugg. Maybe me use to kill wabbit," is a demeaning caricature. I'm not saying you would use such a caricature - just making a point.
So, I think Stone Age people were perfectly capable of "getting it" if God had decided on a more "scientific" narrative. It's just that He had to stop at some level of detail, and He stopped at the point where he deemed the text fulfilled His purpose.
As such, I'm not convinced we're smart enough to better understand God's creative process. We may have more information, but I often doubt that brings better understanding.
Some of it is metaphor - such as the 'Tree of Knowledge of Good and Evil'.
This kind of thing I find very curious. Maybe the tree is only a metaphor, but why couldn't it have been a real tree? I think there is a post-modern hesitancy to believe the amazing. We don't like to think God used "magic" - that eating some magical fruit produced a change in Eve ... and so we fall back on what alternatives? God sent a fairy-angel to ding her on the head with a wand? Or God is disconnected and left Eve to discover evil on her own?
I believe God interacts with us, and I believe those interactions are physical. I just had this kind of conversation with an unbeliever about the Eucharist. She was asking if the bread and wine are "magic" because they produce faith. My response was simple. If she only accepts the material world, doesn't she think some kind of physical change occurs when people go from unbelief to belief? Well, so do I. The means of grace (bread and wine) in the Eucharist cause a physical change in the believer.
So why not a tree? If the Tree of Life in the Garden* is a metaphor for anything, it's a metaphor of the Cross. And eating from it to obtain life is a metaphor of the coming Eucharist. And that the Tree was producing fruit ...
Again, I think there are plenty of metaphors already articulated in Scripture about such things.
* Note: OK, a different tree than the Tree of the Knowledge of Good and Evil first mentioned, but still one of the trees in the Garden - and interesting in that while the Tree of Life gave, well, life, the other Tree produced death.