According to the Bible and Quran..
-Adam and Eve were the first two humans.
-They had three sons.. Cain, Abel, and Seth.
-Cain k!lled Abel.
-Later Adam and Eve had daughters. Cain and Seth married their own blood line sisters.
But scientifically, a whole population cannot come from siblings marrying each other.
Genetically, starting humanity from just two people and from brothers marrying sisters is impossible.
So, Bible and Quran stories are fictional and Unscientific.
Credits: @zackdfilms1