Wigner offers the best of the rational arguments for God's existence. Nelson's account of recent developments in evolutionary biology is a typical botch-up. Horizontal DNA transfer, inter-specific hybridization, whole genome doubling, symbiogenesis, and genome restructuring have long been known to be important processes in evolution, especially in the plant kingdom. The scientist quoted in the article, James Shapiro, simply suggests they are more common across the taxonomic spectrum than was previously understood. None of these processes are in the least bit mysterious, and certainly don't suggest the intercession of a supernatural being in the evolutionary process. God can be most clearly seen in the existence of the laws of physics and their relationship with pure mathematics, not in the details of evolutionary change.
I think you're right, Jeff, about looking for God in evolutionary change. As Monsignor Ronald Knox noted long ago, the problem with the argument from design is that it gives the impression the world was made for our convenience.