Job 9:6, Ps 75:3
But in the usage of a pre-scientific community, I don't think it's important.
Agree, but then how do you determine what is true and what is not? I guess we have to shed parts of the Bible as the scientific community lifts the haze off of some of the ancient concepts of geography, astronomy, and disease!
This is why the literalists insist that every word in the Bible "must" be true or else God is a liar. If we presume, however, that the authors of biblical books are merely men who were moved (inspired) to write about their faith, and wrote in an imperfect manner and language, with human errancy, and prejudices, then we agree more than I thought, but it also makes the Bible rather unreliable.
Disease. Again, you're looking for the "scientific" answer and apparently will be content with that. In OT times, they apparently had noticed the phenomenon of contagion, vide the treatment of lepers; when Jesus cleansed the lepers, I don't recall any mention of demons. Job was afflicted with boils by Satan, with God's permission, but he was hardly possessed. My own understanding is that disease entered the world through sin -- as one of the Church Fathers (I forget who) put it, since man disobeyed God, so his own body will not obey him. I'm not concerned with "proving" it to anyone; to me, it rings true, though it says nothing about whatever cellular mechanisms or whatever are involved.
As for the Bible being "reliable," I take the historical books as being as reliable as any history we have -- certainly moreso than whatever source you rely on for your understanding of Galileo and the Church. ;-)
Of course, I still assume the Trojan War happened, even if archeology hasn't found any evidence of it yet! In fact, I consider most things scientific mildly interesting, but subject to revision. (And if the Bible were intended as some sort of diviney inspired All-purpose Boy Scout Handbook, surely it would have said something about Anthropogenic Global Warming!)