Actually its what the Bible teaches.
Creationists who hold the monogenist view (i.e that everyone came from Adam on Eve), have the huge problem of explaining where all the different races came from and also it means they support incest.
If you believe everyone sprung from Adam and Eve on earth then that means you have to believe in incest. I see that as anti-Christian and immoral and it contradicts the laws in Leviticus.
Pre or co adamism sorts all this mess out and is supported by the science.
Every one on earth born of Adam, is "Adam". That is the name of our human being race.
The one Adam "kind" is made male and female, and is one spirit, one blood, one flesh, one bone -with the remnant/residue/share of that one spirit belonging to each Adam soul conceived, after the first father was created as spirit, body, and soul.
Adam married his other half, which was "built up "from his own rib bone, with a bit of flesh, and a remnant of the one Adam spirit.
The female Adam and the male Adam make one Adam flesh, which is why the Word of God teaches that a male or a female in sexual relation with the same gender is perversion, fornication, lawlessness, and iniquity.
"Male and female made He them, and called their name Adam, in the day they were created" -Genesis 5:2.
He made them one spirit -Malachi 2:15.
He made them one blood -Acts 17:26.
He made them one bone and one flesh -
Gen 2:23 And Adam said, This [is] now
bone of my bones, and flesh of my flesh: she shall be called
Ishyah, because she was taken out of
Ishi.
All Adam is made male and female, and is one bone, one blood, one flesh, and one spirit; with each having the residue of that same one Adam spirit, when they come into their being.
So Adam married his clone, with the "y" canceled and the "x" doubled.
So Adam married his sister, and his female/ishyah sister is his wife.
You cannot get any closer marriage than that, in the Word of God.
Jacob is recognized as the
bone and flesh of Laban:
Gen 29:14 And Laban said to him,
Surely thou [art] my bone and my flesh. And he abode with him the space of a month.
Brethren are one bone and one flesh. So are cousins one bone and one flesh, just removed a bit more out from the first parents.
Jdg 9:2 Speak, I pray you, in the ears of all the men of Shechem, Whether [is] better for you, either that all the sons of Jerubbaal, [which are] threescore and ten persons, reign over you, or that one reign over you? remember also that
I [am] your bone and your flesh.
All the tribes of Israel recognized they were one bone and one flesh together, with David:
2Sa 5:1 Then came all the tribes of Israel to David unto Hebron, and spake, saying, Behold,
we [are] thy bone and thy flesh.
And so it goes. God only made one human being flesh son, in the beginning, called the Adam flesh; and
He made Adam male and female, as I posted the Scripture for, so as to multiply the seed which was named in the Book of Life, and created and placed in the loins of the male Adam, and multiplying by the Adam spirit/life in the seed, through the womb of the female Adam and for the purpose of being multiplied human being sons of God [as a temple for the Glory of the Creator to indwell], as Malachi 2:15 states.
But Adam fell, lost the son-ship by his death in spirit, and lost the Glory and the hope for the Glory coming ever again into His defiled temple of clay. But the Person of God the Word, in whose image Adam was made [Romans 5:14]is now come in flesh, as He always planned, so as to be the Firstborn Son of God of the human being kind, in the New Man name, and Redeemer/Kinsman to the lost Adam seed.
As Kinsman-Redeemer to the Adam brothers of Him, He Atoned for the sins of the race, so as to cleanse the souls of those born in Adam, so that He could regenerate them in Spirit, as adopted sons in His own New Man name; whom He will also regenerate in the body of flesh at the appointed time.
The adoption is called second birth of Spirit and of body, when both are completed.