Let's just focus on the mammals for now. There are 29 orders, so the Biblical kinds can contain one or two orders apiece {corrected because I wrote it backward from what I was thinking the first time: the 29 orders can contain one or two of the 43 "kinds" that DH had mentioned before, apiece; still close enough, not far off from a 1:1 ratio of mammalian orders to kinds}. Some orders contain only one species, but others contain a bunch. One order contains all canines (including bears), felines, weaseles/martens/badgers/minks/mongooses/ferrets/wolverines {I left out civets!}, raccoons, pandas, otters, and seals & sea lions & walruses; another order contains the horses and all horse-like critters plus tapirs and rhinoceroses; and another order contains deer, antelope including giraffes, cattle, sheep/goats, pigs/boars, camels... peccaries, and hippopotamuses. (It could be argued that it should also include whales, porpoises, and dolphins, but not manatees, but I'll leave them out for now.)
OK, so that last list of animals I made all came from one kind, consisting of two (or possibly seven, depending on which Bible verse you accept and which one you discard) individuals a few thousand years ago. That's the amount of diversity that can come from such a small group in such a short time. That leads to some really odd things, though:
1. The rate of evolution that you're telling us must have happened there is EXTREMELY fast, but has now stopped, because we can see that it's not happening at anything like that rate now. Actually, it had already stopped by a few centuries ago, when reliable records of the exact, detailed traits of different species of a wide variety of animal groups started getting recorded. So, why did evolution go so fast at first (producing both pigs and giraffes from a single source in a few thousand years), and then freeze, all over the world?
2. Why did some of the kinds on the Ark, including us, not evolve so much right afterward while others did?
3. Some of these species were mentioned as separate entities from each other, before {the end of} the flood, in the Bible. Abel is described as raising and sacrificing sheep, not something that would later evolve into cattle and sheep and pigs and so on. Noah is described as taking "cattle" aboard, not something that would later evolve into cattle and sheep and pigs and so on. And he has slightly different instructions for "ritually clean" and "ritually unclean" species, even though clean and unclean species (such as cattle and pigs) descend from what was just one kind back then. Also, ravens and doves are two distinct species aboard the ship. How is it possible to have different species counted and handled separately like this, when they were not yet actually separate kinds of animals from each other? How could the people even have had concepts and names for them when they didn't even exist as separate things yet?
4. Similarly, Genesis describes some human cultures existing before the flood in a way that indicates that those cultures are familiar to the book's post-flood readers. (Jabal was the ancestor of the "herdsmen who live in tents"; Jubal was the ancestor of "those who play the harp and pipe".) But these cultures had no representatives aboard the ship. How did the same cultures, separate from each other and from the culture whose book this was, exist both before and after a flood that wiped out all but one family?