Well, many of the numbers I described do, in fact, show up in the narrative you’re describing. But let’s switch to a different way of looking at it.
Assuming evolution isn’t true, and the flood was a literal world-wide catastrophe, Noah would have had to round up every animal on the face of the planet (including the kangaroos of Australia, Buffalo from North America, elephants of Africa, etc.) from vastly varying geographical regions, and hold them for 40 days in what amounts to a relatively small space with limited resources (a cubit is the length from your wrist to your elbow). On top of the logistical nightmare that that would be in today’s day and age (not even taking into account the infeasibility of the time), there isn’t enough water on the world to flood over every bit of land so suddenly and retreat so suddenly. Perhaps this would be possible with a great regional flood, as I would suggest is the case? But not a global one, as the text would literally suggest. Again, consider – there are two accounts of the narrative, which actually happened? One pair of ever animal, or 7 pairs, clean and unclean? The two accounts appear to contradict each other, and if they are read literally, which one is to be taken as truth?