Noah’s ark

My next door neighbor randomly asked me if I believed in God.  I said, no, and asked if that bothered her, and she said no, that she thought the Bible was a bunch of myths, that she was a lapsed Catholic and that she wanted to be created and thought that if God cared for her, he would create a new body for her to go to heaven.

But when she was talking about the myths, she brought up Noah’s ark, and how could two of all those animals fit into the ark?  And I said, yes, and there were seven of all the clean animals.  And she gave me the “you don’t know what you’re talking about” look.

Gen 6:19 And of every living thing of all flesh, two of every sort shalt thou bring into the ark, to keep them alive with thee; they shall be male and female.

20: And of fowls after their kind, and of cattle after their kind, of every creeping thing of the earth after his kind, two of every sort shall come into thee, to keep them alive.

21: And take thou unto thee of all food that is eaten, and thou shalt gather it to thee, and it shall be for food for thee, and for them.

22: Thus did Noah according to all that God commanded him, so did he.

7:1 And the Lord said unto Noah, Come thou and all thy house into the ark, for thee have I seen righteous before me in this generation.

2: Of every clean beast thou shalt take to thee by sevens, the male and his female, and of beasts that are not clean by two, the male and his female. 

3: Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth. 

8: Of clean basts and of beasts that are not clean, and of fowls, and of every thing theat creepeth upon the earth,

9: There went in two and two unto Noah into the ark, the male and the female.

15 And they went in unto Noah into the ark, two and two of all flesh, wherein is the breath of life.

16: And they that went in, went in male ad female of all flesh, as God had commanded him, and the Lord shut him in.

8:18 And Noah went forth, and his sons, and his wife, and his sons wives with hm

19: And every beast, every creeping thing, and every fowl, and whatsoever creepth upon the earth, after their kinds, went forth out of the ark.

20: And Noah builded an altar unto the Lord, and took of every clean beast and of every clean fowl, and offered burnt offerings on the altar.

So my point is, there’s definitely a conflict here in these numbers but even if you say it was only two because that number appears more often, then how do you explain the burnt sacrifice afterward?  That would eliminate all of the clean animals because you’re eliminating one of them.

And secondly, the clean and unclean animals were not defined until much later.  How would Noah have known which were clean and which weren’t?