I need this sort of information to talk about creationism with an agnostic friend of mine. I know about the passages in Genesis, naturally, but I heard there are some more in the book of Job, somewhere. Also, I believe there are some other passages about creation I certainly haven't heard about.
The main text on the subject of creation is the Genesis account. The first few chapters are there to present how God created the world, not to present a twenty-first century scientific thesis. So God provided a simple explanation. A bit like saying that the sun rises instead of talking of the rotation of the earth around the sun.
This being said, this part of the Bible is regarded in many different lights. The first position is the literal position, which says that the heaven and earth were created by God in 6 twenty-four hour periods. This position is held by Answers in Genesis for example.
Another position is that the first few chapters of the Bible are poetry. Then you can believe anything you want on the subject of creation, because the author of Genesis uses poetry as he opens his book.
Then there are positions between the two poles described above:
The rest of the Bible and creation
The six days of creation are quoted elsewhere in the Bible:
The Bible present Jesus has the author of creation in a few verses. (This make biblical sense because Jesus is the word of God, and in creation the only tool used is the word of God.)
The passage in Job you mentioned is
Conclusion From my reading of scripture the Bible supports a literal six-day creation. When did that happen? There are different theories about this as well.
Some argue against a six-day creation, requesting proof. There is no way to prove creationism, but the same is true for evolution. Your position is a question of faith. This being said, it does not mean that you don't ask questions about your position. The starting point of reference in your thinking system, today's science or the Bible, will greatly influence your position.
This might not help you with your discussion with your agnostic friend, but I hope that it helps you in your personal thinking on the subject. Your question is a valid one, but answering it in a few sentences is hard.
No, frankly, there isn't.
Not because it it "wrong" as such, but for the reason that everything in genesis is not testable, cannot be studied, etc. All that is presented is a proposal. Here is an alternative proposal I used the other day (paraphrased):
The details in the proposal (trees/green) may be consistent with observation, but that is not evidence that the proposal is true. It only says that the argument is not internally inconsistent and/or trivially untrue. This is not evidence in any way, otherwise anything can be shown to be "true". This applies directly to genesis: it is not sufficient to say "see, nothing in there is trivially untrue" (especially when we have to deny existing observation to make even that modest claim).
Since the obvious contrast here (see David's answer) is the scientific approach, and things like evolution; this is testable, and through testing has both proven that it is a useful representation, and provided new approaches (a lot of medical science, for example) that were discovered because of the theory, and their effectiveness directly supports that the theory is valid. The effects of evolution, despite contrary myth, have also been directly observed (not just theorised from fossils). Yes the theory is still evolving [sic], but it is essentially proven.