Major, I realize all that but what I was getting at, since you said, "Evil has no existence of its own; it is really the absence of good (post#14), I asked "how would you explain the existence of tree of good and evil?"
Well.....I guess I did not say it correctly. I will try something else.
God put the tree of knowledge of good and evil in the Garden of Eden to give Adam and Eve a choice to obey Him or disobey Him. If that is not a TEST then I have no idea.
There was nothing essentially evil about the tree or the fruit of the tree. It is unlikely that the fruit, in and of itself, gave Adam and Eve any further knowledge. That is, the physical fruit may have contained some vitamin C and some beneficial fiber, but it was not
spiritually nutritious. However, the act of disobedience was spiritually deleterious. That sin opened Adam’s and Eve’s eyes to evil. For the first time, they knew what it was to be evil, to feel shame, and to want to hide from God. Their sin of disobeying God brought corruption into their lives and into the world. Eating the fruit, as an act of disobedience against God, was what gave Adam and Eve the knowledge of evil—and the knowledge of their nakedness.
God did not want Adam and Eve to sin. God knew ahead of time what the results of sin would be. God knew that Adam and Eve would sin and would thereby bring evil, suffering, and death into the world. Why, then, did God allow Satan to tempt Adam and Eve? God allowed Satan to tempt Adam and Eve to force them to make the choice. Adam and Eve chose, of their own free will, to disobey God and eat the forbidden fruit. The results—evil, sin, suffering, sickness, and death—have plagued the world ever since.
The only way I know to explain it's existence was that it was a "TEST" from God to man. Man failed!