Well there are two elements to this:
1) if a creationist wants to claim - "God made it happy and his magic made the story true" - well that's not subject to falsification because it relies on a magical figure beyond science.
2) If a creationist wants to claim - "The flood happened and this is supported by science" - well that
version is open to scientific enquiry (well I say "open", it's nonsense in terms of being based upon any form of reality).
If you want to claim (1) - great, but it's nothing to do with science (which is what we dicuss in the science forums)
If you want to claim (2) - well, hard shit, you are wrong.