...they call themselves "scientific" creationistsand they are a growing power in the land..
Well which is it? Clearly lost or a growing power?
There are many unscientific ideas that somehow manage to accumulate followers, and sometimes political power. Look at astrology, socialism, global warming, etc. No end of examples. As I read it, Asimov says that creationism is an idea that has lost out in the scientific arena, yet continues to gather followers from elsewhere in society.