I guess that is one way to look at it. But for the sake of discussion the might be another way to look the text of Cain and Able.
But of course Abel's flock was fat, Abel was disrespecting Cain's property's right by running his flock upon his Cain's fields where they consumed the fruit of Cain's labor. And of course the LORD had respect for what the treatment of the flock which appeared to be well taken care of, yet what does the LORD need with food for the flesh seeing that the Holy Ghost is a Spirit? What do you feed the Lamb who was slain from the foundation of the World?
But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell. Genesis 4:5
How would you feel in Cain's position, you worked hard and another profited from stealing it?
And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen? Genesis 4:5
If you ever had anything that you worked hard for that was stolen or destroyed by someone else, did you get upset? Did it bring you down?
If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him. Genesis 4:7
Well of course the LORD might have told Cain:
Ezek 3:19 Yet if thou warn the wicked, and he turn not from his wickedness, nor from his wicked way, he shall die in his iniquity; but thou hast delivered thy soul.
Ezek 3:20 Again, When a righteous man doth turn from his righteousness, and commit iniquity, and I lay a stumblingblock before him, he shall die: because thou hast not given him warning, he shall die in his sin, and his righteousness which he hath done shall not be remembered; but his blood will I require at thine hand.
Ezek 3:21 Nevertheless if thou warn the righteous man, that the righteous sin not, and he doth not sin, he shall surely live, because he is warned; also thou hast delivered thy soul.
Therefore in Genesis 4:8 And Cain talked with Abel his brother:
[Could it have been about Abel grazing his flock Cain's field?]
And as the Genesis 4:8 continues, and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.
What was Abel doing in Cain's field? Where do you think Abel's flock was when Cain rose up against his brother? So do you have the right to protect your property from people stealing it?
So did the LORD really not know where Abel was? It is written in Genesis 4:9 And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?
Or did the LORD walk past the crying spirit before he approached Cain? And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground. Genesis 4:10
And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand; Genesis 4:11
So Abel spirit descended into the earth and what happened to Cain, the LORD cursed him from his presence back to Nod, on the east of Eden which the LORD God had drove the man off of Eden to dwell upon the earth [1] whereby Cain was given a wife, and unto him was a child born and he built a City and named it after his son. [2]
[1] Gen 3:23-24
23 Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
24 So he drove out the man; and he placed at the east of the garden of Eden Cherubims, and a flaming sword which turned every way, to keep the way of the tree of life.
[2] Gen 4:16-17
16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
17 And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.
Luke 9:27