This question is often asked, and the answer is simple.
Scientists are people who do science.
By definition, any scientist, regardless of philosophical perspective on origins, can do good science. If individuals claim to be scientists, this is what they ought to be doing. In this book, Dr. Brand lays the ground rules of a philosophical system he refers to as Interventionism. Simply stated, Interventionism means God can and does occasionally exercise Himself in extraordinary ways in His Creation. It is only when we are considering those areas of inquiry that are not subject to direct empirical investigation, such as the origin and geological history of earth, that the kinds of science done by Interventionists and Naturalists become distinct.