Cain and Abel: Explanation Please. Pretty Pretty Please!

[Jenny A]

The first genealogy I referenced was from the 5th chapter of Genesis.

The Bible clearly makes a distinction between the descendants of Abel and the descendants of Cain.

Read your own dang book. Abel doesn't have any decedents but Adam's son Seth does.

And yes the descendants of Cain and Seth are listed separately. Cain's are given in Chapter 4 just after Cain is banished and Seth's are given just after Seth's birth is recounted for a second time in Genesis 5:1-3. So? They would have different descendants since they are two separate people. And Genesis 4 still says that they are both sons of Adam and Eve.

Genesis 6
6 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,
2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.

Adam was a son of God, making his children also sons of God. The nature of Cain could not have come from Adam.

You need to read that whole section. It was not Adam and his sons who are referred to as the sons of god, it's the Nephilim i.e. angels.

"When people began to multiply on the face of the ground, and daughters were born to them, 2 the sons of God saw that they were fair; and they took wives for themselves of all that they chose. 3 Then the Lord said, “My spirit shall not abide in mortals forever, for they are flesh; their days shall be one hundred twenty years.” 4 The Nephilim were on the earth in those days—and also afterward—when the sons of God went in to the daughters of humans, who bore children to them. These were the heroes that were of old, warriors of renown."
Genesis 6:1-4

The sons of god referred to were divine beings who took up with human woman.

Luke 3:38
Which was the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God.

The descendants of Adam were long lived and once the two bloodlines began to mix, it shortened their life expectancy.

You're nuts. Adam was the son of God in that god created him. There's nothing about that that negates the clear statement in Genesis 4 that Cain was the son of Adam. Nor is there any suggestion that the mixing of blood was the reason for the decrease in lifespan. God simply declared that he would reduce man's lifespan.

Also, did not God say to eve that he would put enmity between her seed and the serpents seed? So the serpent clearly had a "seed". If you notice, knowledge came through the line of Cain, they were the inventors and scientists.

What Genesis 3:15 actually says is:

"I will put enmity between you [the Serpent] and the woman [Eve],
and between your offspring and hers;
he will strike your head,
and you will strike his heel."

Notice the serpent's off-spring and Eve's are separate.

And Cain's descendents dwelt in tents, lived with herds, played the lyre and the pipe, and forged copper and iron. I don't see that they acquired knowledge generally. Genesis 4.

Please show where it says in the Bible that Adam disowns Cain as his son.

It's implied by Adam's acceptance of Cain's banishment. Clearly, that was the last he saw of Cain as Cain was banished.