If, after some critical mass of research, the hypothesis is maintained, it is elevated to theory.
Okay, actually, on due consideration, there is a 'critical mass' of research that a theory can hit.
The theory of Phlogiston is STILL the theory of Phlogiston.
It's just an obsolete theory because research has found that there are better explanations for the observations that led people to theorize that such an element might, or even must, exist. That's a critical point in a theory's development. Evidence against.
Now, a problem with creationism is that it's not a scientific theory. There aren't observations that have been made that cause people to think, for example, that there has to have been a global flood in the last 10k years. It comes from a book of stories. People work hard to find the evidence for that, and they cherry pick actual scientific research to find things that are consistent with the conclusion they want to come to.
It's not the same thing at all. Science doesn't work backwards from the approved conclusion to decide which evidence is admissible. At the best you can filter evidence that's 'not inconsistent with' your conclusion.
Take a look at the chalk deposits in the White Cliffs of Dover. Just how many tiny sea animals died to create one ton of chalk? And how many tons of chalk are represented in Dover? How much chalk is there in the whole fucking world?
If all the world's chalk deposits were created 6000 years ago, in a single global flood, the waters would have to have been positively teaming with those life forms. Beyond teaming, the seas would have been a slurry of life forms. There wouldn't be any room for the sea water. The mass of plankton would have filled the depths of the seas, piled up above the lands, covered the planet to some noticeable thickness. Noah might have noticed that the 'flood' never actually reached the world's surface because it was insulated by a sheath of sea life with no sea....
It's much, much easier to imagine a slow accumulation over years upon years upon eons than trying to imagine what the world would have looked like before the Fludd if all chalk dates to that one year-long event.
Plus, with all that sea-life represented by chalk, how could there have been enough plant matter to make coal and oil? And to support the plant and animal life that got fossilized?
You'd almost have to theorize that the Earth was about the size of Neptune right before the Fludd and God got a little overzealous when he mashed it all down to make fossil fuels and fossil chalk and fossils....
But again, that wouldn't be a scientific theory. There's no scientific observation that the world used to be a fourteen-mile-thick blanket of plants and a seventeen-mile-thick blanket of plankton. The only reason the theory would exist would be an attempt to make the story match the world we actually see.
Thus, not science, but a rationalization.