This isn’t the kind of theology you find among most creationists, not even the believers in Pre-Adamite races, but interestingly it is pretty much exactly the folklore about Iblis (the Devil) and the djinn that became part of popular Islam. As told in the medieval Akhbar al-zaman, God created various races of supernatural djinn, many of which were giants, and these were destroyed when Iblis descended from heaven and killed most of them. Iblis, in turn, became the Devil when he failed to prostrate himself before God’s replacement for the djinn, Adam. I wonder how many Christian fundamentalists or biblical literalists would still support these claims if they knew they originated in Islam.
Our author goes on to ask whether the Pre-Adamites are connected to other fringe history claims:
But is it possible that Pre-Adamite civilizations existed on Earth? And better yet, is it possible that these ancient Pre-Historical civilizations might be connected in some way to the lost "civilization of Mu and Atlantis"? (emphasis in original)