What has the initial claim got to do with evolution? It seems to be saying that if you have a child it will most likely die from lethal mutations. This means that if the creationist is right, that human reproduction is impossible. They have obviously misinterpreted a scientific claim or falsely stated it. Also, isn't it funny that to try to counter evolution, they use (misuse) data from biologists and biological science. So, they don't believe the biologists when they say evolution is a fact, but will accept as true anything said by biologists about genetics, and then put their own spin on it.