Angel is a job description. It means messenger. It's not referring to a type of being.
Most think their eating of the fruit from the tree was their failing a test and bringing what you call sin into the world.
It was not a test, but a warning. Partaking from the tree of the knowledge of good and evil was an analogy for using freewill. God was saying use your freewill and you'll surely die. They doubted God and ate off the tree. Doubting God is what sin is. Adam brought sin to mankind by passing this doubt to his offspring. The other way that we are all punished because Adam did something wrong makes no sense.
If it was a test by God there had to be things that they were tested with. We call them temptations.
Eve ate off the tree because it was pleasing to the eye, good for food AND also for gaining wisdom. One temptation would have been from Satan, but God made the tree pleasing to the eye and good for food. Since we know God tempts no one (James 1:9) this is a lie by Satan planted in your minds that men are doomed by their acts..
You have gotten quite a bit right, there. If you would only rethink that final conclusion.
You are right the tree was not a test. There was no reason for God to test the couple before sin and there is no record of God ever having tested anyone until after sin. Why would that be? It would be because until a cause becomes present to cause doubt to enter love, it is a violation of love not to trust. We can glean that of the description of love Paul gives at 1 Corinthians chapter 13. Therefore the trees had to be a loving warning as you say, a means of helping the couple to keep the importance of their listening to God always at the foremost of their minds.
Paul also said, "Adam was not deceived, but the woman being deceived was in the transgression." 1 Timothy 2:14
So once again you are right that the serpent Satan sowed that idea to eve's mind that she "saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise." Thus being deceived, Eve fell into transgression. The word, "fell", as used by Paul meaning that Eve succumbed to the serpent's trickery.
But Adam, as Paul tells us, was not deceived. What Paul is there telling us is that Adam knew full well the choice he was making was wrong but Adam made that choice deliberately because he decided Eve was more precious to him than God.
We find both types of sin yet in the world today, (Adam) deliberate sin by choice and (Eve) sin by ignorance which pulls the ignorant one into the sin before it even registers to their mind that what they are doing is wrong. We see both types of sin evident also in Paul's words at Romans 5:14 "Nevertheless death reigned from Adam to Moses,
even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come."
God dooms no man, that is completely true. But some men do doom themselves. That is just how it is. Some men actually do love the sins they do so much that they would rather do them than to be faithful to God.
While your idea is childishly cute it falls short by reason of the fact that anyone who prefers sin as the love of their heart will always keep sin alive, thus causing hardship to always be for all men, including for the ones who are precious in God's eyes because they love him.
Thus it is that what you are teaching there at the end of your comment is contrary to God's justice which must champion what is best for those who love him.
You live in a fairytale if you think all men who have tasted sin can be made to afterward hate sin and so reject sin. A simple word search on the words, "destruction" and "destroy/ed" in the scriptures is all it takes to see that. You can twist some of the scriptures to make them seem to fit your idea but you will not be able to twist them all.
