I really like this post by PZ Myers debunking the frankly silly claim of creationist Rob McEwen that mutation can’t create “new DNA structures” (what is it with creationists and their obtuse language?). His answer is a good one and I especially agree with the ending:
I wouldn’t be at all surprised to learn that Mr McEwen is a decent, sincere person in addition to being a fervent believer in his religious dogma. However, he has been consistently misled. His sources have lied to him. And he is working hard to propagate those same lies to more people. That’s the real tragedy of creationism, that it is a fabric of outright dishonesty that persuades good people to do wrong, all in the name of their religion.
I agree with that completely.