With Noah there was a change made, but what did it mean besides the apparent physical dietary change from vegetarian to meat eater?
"Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
But flesh with the life thereof, which is the blood thereof, shall ye not eat." Gen 9:3-4
I see the man going down hill so far that his own blood was in such bad shape that some animals had it while he didn't. Thus the clean animals agreed in the covenant made then to be eaten if needed. (Eating meat without a lot of blood could give man what he needed since you can't get all the blood out.) They groaned but did it until Jesus removed that burden from them. I also think man's access to the Divine Light was cut off to the lights established in the firmament of Genesis 1. Now they got light through the rainbow.
I see the fire separating things when the red heifer was burned. The ashes were "lively spiritual dust" that consecrated every other sacrifice; and men also took them and put them on their heads the way people do on Ash Sunday today. Jesus is compared to that red heifer.
Hebrews 13:12 Wherefore Jesus also, that he might sanctify the people with his own blood, suffered without the gate.
Numbers 19:3 And ye shall give her unto Eleazar the priest, that he may bring her forth without the camp, and one shall slay her before his face:
The word Adam is composed of two parts: A, which is the letter signifying breath or the Holy Spirit, and "dam" which means blood. When Adam fell, he was no better than the animals -- we might even say he was worse. Animals were definitely more righteous than men in the days of Noah; and in the way animals resemble man, they could bear his burden temporarily. They couldn't fix man's fallen spiritual nature, but they could temporarily bear the load of sin.
Man, mortal man, must be baptized by the Fire of Heaven then -- so we see fire at Pentecost when the Holy Spirit lit on them all. We also see it was in the form of tongues. The satanic tongue that Adam and Eve exhibited when trying to excuse themselves to God has to be renewed, purified, replaced by new tongues. As James said man cannot bridle his own tongue. Speaking in tongues, other languages, is one thing -- an outward sign but speaking with "new tongues" is even better. God must bridle the Satanic tongue seen in Adam and Eve the way we see Him purifying Isaiah's tongue -- there it was with a "burning coal." Again fire.
I would not be surprised to find that the "knowledge of good and evil" is equal to the ways of man, the ways of the flesh and that the flesh is equal to the dust...
Is it "knowledge of good" and "knowledge of evil" -- or is it "knowledge of good mixed together with evil"? Eve had some "knowledge of good." She could see the fruit was good. I think she also understood it was wrong to eat the fruit -- she had some knowledge about evil. What stunned her was trying to understand when the two were mixed. She knew about it after eating but couldn't handle it. Yes, they were like God then, but God can handle good mixed with evil. I see the doublemindedness of man as another "gift" from the serpent.