1Pe 3:20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
Only 8 people were saved from the flood,and it appears as if it is the teaching that Cain is of the devil,and his offspring,so if there was wicked that Jesus said you are of your father the devil,they must be the descendants of Cain,so Cain must have been on the ark,but the wicked are whoever does not acknowledge the truth,and does sin.
Gen 4:1 And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD.
Adam and Eve had intercourse,and she had Cain,and said,I have gotten a man from the LORD,not the seed of the devil.
Gen 4:13 And Cain said unto the LORD, My punishment is greater than I can bear.
Gen 4:14 Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me.
Gen 4:15 And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.
Gen 4:16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
Cain went off to another place.
Gen 4:25 And Adam knew his wife again; and she bare a son, and called his name Seth: For God, said she, hath appointed me another seed instead of Abel, whom Cain slew.
Gen 4:26 And to Seth, to him also there was born a son; and he called his name Enos: then began men to call upon the name of the LORD.
Gen 5:3 And Adam lived an hundred and thirty years, and begat a son in his own likeness, after his image; and called his name Seth:
Gen 5:4 And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters.
Through Seth is the bloodline to Noah,and there should of been no one of Cain among the eight,and there sure would not be any of Cain besides the 8 people,for only 8 people were on the ark.
Gen 9:18 And the sons of Noah, that went forth of the ark, were Shem, and Ham, and Japheth: and Ham is the father of Canaan.
Gen 9:19 These are the three sons of Noah: and of them was the whole earth overspread.
Gen 10:32 These are the families of the sons of Noah, after their generations, in their nations: and by these were the nations divided in the earth after the flood.
It is the 3 sons of Noah that the earth was overspread,and populated,and there was none of Cain's family around anymore.
It sounds like the belief that Cain is of the devil,and all his seed,so when Jesus addressed the Pharisees,and said you are of your father the devil,they must be of the seed of Cain,so some of them must of been on the ark.
A sin is a sin,and does not mean Cain is the worse because he slew Abel,and Adam and Eve sinned before he did.