Strict believers in the Old Testament 'young earth creationists' are the most dangerous of all Christians in my view, maybe just pipping those that follow the word of Pius X.
It's one of the reasons why years ago I used to help out with like the 'no answers in Genesis' site, and why myself and many of my skeptical/atheist/evolutionist friends and debaters prepare just that little more carefully when we know we're up against 'YEC' types. It's not that they're better, or more knowledgeable that other groups of religious people, quite the opposite and we have to prepare arguments from a much more basic view point. We always know we'll be debating terms, and definitions and statements in English that seem to take a different meaning to what a standard person might take the meaning to be, existing, extant and extinct are just a couple of often miss understood words in the YEC world.
They'd never, ever state it, but I have often wondered if some of the less socially acceptable activities within the RCC have occurred because they take some lead from the OT. That said, the victims of the child rape (just calling it what it is) are generally male, and not even I am so sure that the bible mentions that anywhere - lots of virgin girl 'taking' but no so much of boys...
The whole thing for me boils down to the cherry picking I mentioned earlier. If the NT with its good news is meant to be a believable text then I don't think it's too much of a stretch to believe that the whole thing should be believed. As I have posted before I am not so sure we should be so content with the idea of only picking the bits we like. I am not so sure we should like or follow a God that came back to tell us (as documented in the true book we're now supposed to believe in) that he meant what he said and did in exodus, numbers etc.