"The first is a typical SJ tactic of issue avoidance by taking an issue to its fallacious extreme."
Its not an extreme. Its the same sort of thing.
"Of course I talk about moonlight and sunsets"
Exactly.
This argument is over.
"My point was that the Old Testament, New Testament and Jesus never told us a single fact about our world that wasn't known already."
No, that wasn't your point. You clearly were taking Genesis to task for talking about the sun and the moon as lights, when it is believed, in fact, that the moon reflects sunlight. However, you have conceded that you yourself use some language. You just think its appropriate when you do it, but inappropriate when the writer of Genesis did it. Clearly a double-standard. Plain as the wart on your nose.

"I would have thought that if God wrote Genesis, he would have said something accurate about creation."
This statement can mean a whole lot of things. I'm having trouble putting the best spin on it, and failing. You do realize that my tagline had you and this thread in mind?

Let's try to summarize this:
1. We use language in various ways, and it is commonly accepted to speak from our frame of reference. Thus, we talk about sunrises, moonlight, and such, from our frame of reference, and we all know what it means, and the statements are even true- within that frame of reference.
2. Now, what frame of reference is Genesis being written from?
I want you to consider question number 2, because in order to answer it you actually have to stop reacting to what you THINK Christians would say and look at the primary source material to find out. So, you say:
"if God wrote Genesis,"
But no one is saying that God wrote Genesis. And if you look at the primary source material, no such claim exists. If you look at the primary source material, Genesis in this instance, the frame of reference is clearly discerned. Genesis is 50 chapters long, my friend, but you are stuck on chapter 1.
3. Even if it were the case that 'God wrote Genesis,' the question of frame of reference would still remain. Is God writing from his frame of reference or from his. However, as I said, no one is saying that God 'wrote Genesis.'
This leads to
4. You have exposed a serious lack of understanding about what Christians mean when they think of the Scriptures as being the 'word of God' by thinking they mean that it was written by God. Thus, any possibility that perhaps you had a valid point is completely extinguished by the fact that no Christian says that. Seriously, I know lots of Christians that don't even understand what it means to call the Scriptures the 'word of God' who still understand that it does NOT mean that God actually wrote it.
Now, in some respects, I don't blame you. How are you to know? Well, you could ask. In another respect, I really do blame you. Even cursory research on the web on the matter will quickly educate you on the basics of the matter.
Now, the new argument you have introduced is an entirely different matter. You will have to decide what your real argument is. Is it the use of language, or is it this new idea that it is not as 'informative' as you like? And does this new argument even hold when it is understand that God is not the actual writer?
I edited this to be nicer.