2) that God created the earth out of water and why He created it out of water
This is a new one on me, although I did come across something that would explain it today. God made the world out of water. . . because that's what the gods in the myths of antecedents and contemporaries did. Other than that, I wish you would explain, because so far I haven't heard this one from other creationists (esp. not prominent ones).
3) How long it took God to create the earth and why it took Him that amount of time
Six days plus rest on the seventh day to provide a model of what we're supposed to do?
4) What sin is
"an act that is regarded by theologians as a transgression of God's will" (google definitions)
5) Why we need a redeemer
Because Satan tricked Eve who shared with Adam from a tree God put in their reach and told them not to eat from, so we're all cursed now.
6) Who our ancestors are
Adam and Eve.
7) Knowledge of Jewish history
What? Like I said elsewhere that's like saying I'm not Maya so I don't know Greek History.
8) what happens after we die
Heaven or hell.
9) Who goes to heaven and why
People who accepted Jesus as the redeemer.
10) Who goes to hell and why
People who rejected Jesus as the redeemer. (And people who never heard of him -- yes, they still exist, but you're conveniently ignoring that.)
11) Who Jesus is
The redeemer, and God.
12) Why Jesus walked on earth
To be the redeemer.
13) That all humans sin
Well yeah, 'cause *points at definition above* if we don't know God's will or even unknowingly violate one of his arbitrary rules (which we can apparently do even as newborns), we have no chance at anything else.
14) What right and wrong is
15) The difference between good and evil
You don't have a monopoly on right, wrong, good, evil, and the knowledge thereof.
16) Why animals (especially imaginary animals) can't turn into people or breed human descendants
On the contrary, we know that too. It's because REPRODUCTION DOESN'T WORK THAT WAY.
17) Why the 10 Commandments are the best way to live
Because they're (mostly) a variation of 'do unto others'.
18) What the old covenant and new covenant are
Jesus nullified the "old covenant", in your words made the old testament laws irrelevant (yet you still insist on following -some- of them)
19) Why Christianity is waning in the world
Because we're being persecuted!
20) Why the Arabs and Jews will always fight each other
Because you won't let them do anything different.
21) Why atheists can't believe the bible
Because we want to rebel against God and sin without consequences right?
22) Why scientists aren't trustworthy
Because they contradict your religion.
So I started out trying to answer the way she would ('cause atheists are not all atheists because we don't understand or know anything about Christianity), but some things I just can't fathom what her answer would be.