So Cain was referring to Adam and Eve here?
14 Behold, you have driven me today away from the ground, and from your face I shall be hidden. I shall be a fugitive and a wanderer on the earth, and whoever finds me will kill me.
Tell me who else existed at the time Cain slew Abel, other than Cain, Abel, Adam and Eve. Please. There is NO record.
Short of showing where anyone is born between Abel and Enoch, you have NO choice but to admit the Bible is lacking in details and is NOT a historically accurate recording of what happened.