There are some creationists who deny evolution, say that Noah only needed distinct ‘kinds’ on the Ark… and then those ‘kinds’ diversified into everything we have today in I guess a few thousand years.
They basically do not believe in evolution and also posit what is functionally a Cambrian explosion that happens something like 10000 times more quickly.
Then there’s the problem of… what would they eat? All the plants are dead. There are only 2 (or 7 pairs at max) of each ‘kind’ of predator and herbivore… ???
Then there’s the heat problem. Apparently sometime in the late 80s or early 90s some scientists got bored and figured out how much water you would actually need to cover the entire earth such that no mountains are above water…
… and what you end up with is so much water, so much energy from it falling to Earth, that basically Earth becomes a multi thousand degree sauna, steam cooking everything.