This is surprising according to the author, because supposedly scientists tend not to believe in God, but is that true? I remember seeing some survey that said most scientists do believe in God but accept the standard evolutionary picture other than its denial of God, including the common origins of all animals including humans (the one element of standard evolutionary theory that some but not all of the ID people deny).
One thing this attitude (that this result should be surprising) ignores is the difference between doctors and scientists. Notwithstanding the fact that the medical industry is in the pockets of the pharmaceutical companies and is more often a for-profit business than a collection of organizations designed to help people, many doctors are in their profession not to make a buck (or at least not just to make a buck) but because they want to be in a profession that serves, a profession that heals. I don't want to suggest that atheists aren't interested in helping people, but it would surprise me greatly if you found a higher percentage of atheists in healing and helping professions than you do in society as a whole. Those who believe in religion-based morality tend to be much more highly represented in such professions. Why wouldn't this apply to those who go to school for eight years to be in that profession?