Ultimately, longing to have a fixed earth reflects the fundamentalist longing to recover that feeling from childhood when you just knew you were the center of the universe, and that parents, life, angels, God and all that exists revolve around you. It isn’t an expression of theocentrism but anthropocentrism and ultimately egocentrism.
A passage from the Bible that is mentioned on the site, however, is worth noting, since it makes it somewhat more likely that there was a historical Joshua, even though he clearly did not do most of the things attributed to him in the book that bears his name. According to one of the sources used by the author of Joshua, the Book of Jashar, Joshua addressed himself to the sun and moon. Since the author of the Book of Joshua opposed the worship of the sun and moon, and in his editorial comment makes it the LORD who stops the sun and moon in response to Joshua, it is clear that there was an earlier story in which the sun and moon were addressed as the Sun and Moon. How early this source was, and whether it is based on early historical traditions, we cannot tell, but at least it is clear that Joshua is not merely a figure invented from scratch in the time of king Josiah.