It appears that the author of Genesis knew what he was doing when he wrote that the first human—i.e., the first human born of a woman, Adam and Eve’s first-born child—was a murderer.
Not a singer, or a painter, or a dancer, or a cook.
A murderer.
Ancient interpreters concluded that Cain’s descendants all died in the Flood, but that is obviously untrue.
Even a casual reader of news headlines knows that we are all the children of Cain.