(What relevance does this have to astronomy? Err... defending a young earth theory and hence the age of the universe, but if you guys can concentrate only on the remainder of this post, that would be great!)
I was thinking of the problem with the theory of evolution in reference to an analogy of computer programming. So you'd need to be a bit of a geek to understand it! Please forgive me, this is my first post and I don't do Biology. In fact, I'm a finalist for BSc Computer Science, hence this particular analogy...
I know that some people (not sure exactly who) suggest that the random changes in DNA enhance a human but I struggle to find anyone who can identify any case in which DNA has been positively changed.
Imagine 6.2 billion similar computer programs running at once via interpretation mode - ie, executed on their source code. Random mutations can be said to involve the random change in compiled tokens for your code. In other words: Parts of your code for one person change randomly and these changes accumulate.
It is feasible that some changes would be beneficial - such changes would optimize your code and if you're lucky enough, you may be able to do something you couldn't before (sickle cell), but my consideration is that it is much more likely that a change would harm the program (diabetes) and some may crash it altogether (cancer). My conclusion is that genetic malfunction is much more common than genetic enhancement.
Or, if you're not a computer scientist, imagine instead a paragraph in which letters randomly change / added / removed. Whole new words COULD be formed, but you're likely to end up in gibberish after a while.
I enjoy structured, reasoned argument. I look forward to some replies, both in support and against!