A) at the time this was written, Scott lived in the Midwest B) Scott worked at a hospital at the time, which selects a bit against those who are creationists. In my opinion, probably 40% of the nurses in such a hospital would be creationist, but maybe Scott disagrees with me about that assessment C) in terms of socialization outside of work, Scott is not an extrovert, so I can imagine arbitrary levels of selection and that it is plausible he did have 0 creationist social acquaintances (maybe the quote is only even talking about his social acquaintances, not his work ones)