Cain and Abel: Explanation Please. Pretty Pretty Please!

[Huggy Bear]

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

Typo, Obviously I meant Adam

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.

Wrong, if they were angels, that would mean that they have the ability to create (since angels are spirit beings, they would have had to create themselves bodies capable of procreation), the only creator is God. And also doesn't the Bible state that he made Jesus, God's only begotten son, "a little lower than the angels"? If Christ, who being the beginning of the creation of God and his only begotten son, was lower than the angels by being human, this means angels cannot be "sons of God" because they were never created in his image.

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.

You have no scripture that states that Cain is Adam's son, what you have is Adam having carnal knowledge of his wife twice and Eve bearing three children, which would make Cain and able twins, and you can find nowhere in the Bible where it states that they were twins.

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.

Actually this is what it says. This is God speaking to the serpent.
Genesis 3
15 And I will put enmity between thee and the woman, and between thy seed and her seed;