Contradiction with Genesis 6:17
This verse predicts a flood to destroy all life, which contradicts the command to leave the ark in Genesis 8:15 that assumes survival.
Genesis 6:17: And, behold, I, even I, do bring a flood of waters upon the earth, to destroy all flesh, wherein [is] the breath of life, from under heaven; [and] every thing that [is] in the earth shall die.
Contradiction with Genesis 7:4
This verse states that a flood will destroy all because of the wickedness on earth, conflicting with Genesis 8:15 where the world is habitable again.
Genesis 7:4: For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth. [destroy: Heb. blot out]
Contradiction with Genesis 7:21-23
Describes the total destruction of all living things, yet Genesis 8:15 commands Noah to exit the ark, implying life was spared.
Genesis 7:21-23: And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man:
Contradiction with Genesis 6:13
Here God announces the end of all flesh, clashing with Genesis 8:15 which involves continued life through Noah's departure from the ark.
Genesis 6:13: And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and, behold, I will destroy them with the earth. [with the earth: or, from the earth]