Creationists use the word "theory" as though it's equitable to mere guesswork and thus try to diminish theorizing as a legitimate tool for research. Fair enough. But then why, pray tell, are creation "scientists" working so hard to raise their creation myth to the level of a legitimate scientific theory?
It`s not about raising a creation myth to the level of a legitimate scientific theory, rather it is examining the world from a Biblical perspective. Genesis speaks of a young earth and a global flood. So we should be able to find evidence for this if Genesis is true. That is the approach.