Basically in Job all of Job's possessions and things are taken away to prove that he will still love God despite losing all of his possessions. Then there is the part in the New Testament where Christ says it is easier for a camel to pass through the eye of a needle than for a rich man to enter the kingdom of heaven.
The way that I've heard the whole prosperity thing taught was this: It's foolish and wrong to actively and greedily pursue objects, money, etc. just for the sake of having them. However, as a believer, Christians believe that God will provide for them what they need, as long as they continue to work hard and be faithful to His Word.
At least, that's what most reasonable Christians I know take it to mean.
Back to the topic at hand, though. Interpretation of the Bible has been going on since before it was even compiled into a single volume. The problem is when people actively change what is written in the Bible in order to fit their worldview. To me, if the Bible is the Word of God, which I believe it is, it's wrong to change it, since you're putting words into his mouth or taking them away.
You can interpret the words however you wish, just don't change the words themselves.