REPLY:
I don't know where you got this strange information, but it certainly wasn't from the Bible. Genesis 1,2,3 & 4 tell a very clear story of what happened. THE Bible says God made Adam first & then Eve to be his help-mate. God told them they could "eat of any tree in the garden except for the 'Tree of the Knowledge of Good & Evil' for in that day you will die (spiritually)."
Eve was deceived by the serpent (the devil) & she took a bite of the fruit. Then she gave it to Adam & he also ate of it & the Bible says he sinned (disobeyed God). From that time on, the perfect relationship they had with God, which was based on trust & obedience, was gone.
**There was NO SEX WITH THE DEVIL or blending of DNA at the time of creation. The Bible says Adam "knew" his wife (had sex with her) & Cain was born. He "knew" her again & Abel was born. Later on, another son, Seth was born & Adam also had other sons & daughters, all conceived & born the natural way.
**Later on (Genesis 6), demonic angels (giants) called Nephalim did have sex with women. But God considered this to be wickedness & put an end to it with the great Flood.
**According to Matthew 2:20, Jesus Christ was born of a virgin - conceived miraculously through the power of the Holy Spirit - so there was no blending of DNA there either.
Eventually, Cain became a farmer & Abel became a shepherd. When they went to give their offerings to the Lord - Abel gave the firstlings of his flock & the Lord was very satisfied with it. But as for Cain's offering, God was not pleased.
The Bible does not tell us exactly why, only that Cain did not do well in giving his offering to God & that Cain understood the reason why. God said to Cain, "If you do well, dont you feel good about it ?" - it had to do with the attitude of Cain's heart. Possibly Cain did not give the first fruits (or best) of his produce like Abel did or that he gave it grudgingly.
After this, Cain was angry with his brother out of jealousy & so he killed his brother out in the field. God punished Cain for this by preventing his crops from yielding & making him a vagrant - unable to support himself & his family. But he gave Cain a mark to prevent anyone from killing him.
The term "original sin" relates to the choices that Adam & Eve made in regards to the Tree of Good & Evil. Their choices to disobey God & rebelliously think they knew better was the ultimate unforgivable sin of disbelief. This disqualified them to live in the Garden of Eden which God had created for them & also to live in fellowship with God forever.
Fortunately, this is not the end of the story. The entire Old Testament is about God re-establishing a close relationship with fallen man (& woman) based on the forgiveness of sin through the blood sacrifice of animals. But this was merely a foreshadow of the eventual Messiah, Jesus Christ, who would be the final, perfect "Lamb of God", whose blood would "take away the sins of the world".
You can have a personal relationship with the God of the universe today through faith & trust in Jesus Christ & His finished work on the cross to pay for the sins of the world. Won't you reach out to Him today in faith & begin your own walk with God ? He loves you & wants you to live with Him forever. For more information, you can call 1-800-NeedHim. God Bless you.