I wrote this years ago, and some of it is kind of dated, and the updated figures only make matters worse for the ark story. But I grew so tired of having to tell creationists the same arguments over and over, that I created a little file. Here's what's left after several years of neglect. There may be spelling errors in there, Mea Culpa. Wrote it in notepad, no spellcheck back then.
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1) a wooden boat made to Bible spec? Would break in 1/2 with the first 3 foot wave. Ark fail.
2) a wooden boat that size, without a rudder, would founder and sink with the first set of 5 foot waves. Ark fail.
3) there was only 1 hatch-- in the top-- how did they muck out the manure of 5 MILLION species of animals? Ark fail.
4) not enough room for food-- too small. Ark fail.
5) what did the meat-eaters eat? Every time Noah fed the lions or the tigers? *poof* a species of animal IS EXTINCT. Ark fail.
6) there is not enough water on the earth, to flood all the mountains, as specified in the Bible. Ark fail.
7) if it did rain enough water (magic?) in only 40 days, to cover all the mountains? The rate of water-fall would be as dense as actual water-- like being IN a waterfall, in fact. Such a high rate of fall, would have destroyed Noah's wooden boat in minutes.
More: Everything would have drowned, too. Ark fail.
8) Noah did not bring trees onboard. Any biologist knows that trees, when drowned, die.
Noah was no on-board long enough for new Olive trees to re-grow in time for leaves to be found by his dove. Ark fail.
9) Terrestrial plant seeds, if immersed in water for very long-- several days-- will simply rot and die. After the whole earth was flooded, the Bible says nearly a year, before the water "went down"... WHERE? This would have destroyed ALL plant-life on earth.
Once Noah opened his boat? He would have seen nothing but deadwood and mud. All the plant-eaters starved within days.
Ark fail.
10) Once the ark was opened? Who fed the meat-eaters? Oops! The Tigers just ate that gazelle-- and now gazelles are extinct.
WHAT DID THE MEAT-EATERS EAT, AFTER THE ARK WAS OPENED? Only 2 pair, after all! Ark fail.
11) I guess the Unicorns, as mentioned in the Bible did not make the cut, onto the ark.... Ark fail?
12) What did Noah and his idiot sons drink, while on the ark? All the hatches, according to the Bible, were CLOSED. There was not enough room on-board, to carry enough water for Noah for nearly a year-- LET ALONE ALL THE ANIMALS, TOO. Ark fail.
13) Why are there ancient cities-- UNBROKEN-- from before the ark, right on through it's alleged happening, NO FLOOD, and on to today? Ark fail.
14) China. Unbroken history, to thousands of years PRIOR to the ark. No flood story. Ark fail.
15) Cave paintings in Europe. Charcoal. Immersion in water would have erased them. These are 15,000 years and older. Ark fail.
16) Rocks. If there were a global flood? You would see a universal, world-wide layer of compressed mud-- DATING TO THE SAME TIME. This is not the case-- not even a little bit. Ark fail.
17) Dead fish. Noah was >>not<< instructed to bring fishes onto the ark. Yet? Putting enough fresh (rain) water into the salt oceans to cover the mountains, would dilute it to dangerous levels-- KILLING ALL LIFE IN ALL THE OCEANS, EVERYWHERE.
From whence did modern sea life come from, then? Magic? Ark fail.
18) Insects. The number and variation of species of insects alone-- would have filled up the ark, hundreds of times over. Ark fail.
19) Birds. The number and variation of bird species-- including all the UNIQUE ONES from all the islands, would have filled up the ark multiple times over. Ark fail.
20) HOW did the animals get from the ark, to Australia? The animals living there now, and back to pre-historic times, are UNIQUE to that continent. And the Bible has NO MENTION of them-- AT ALL. Ark fail.
21) If the human race descended from Noah and his idiot sons?(By having sex with his daughters--as the Bible documents...)
Then we would see a genetic bottleneck, roughly 4,000 years ago, in the human genome. Do we see this? NO. Ark fail.
22) The population of the world, in 3,000 BCE, is too high, if all humans came from 4 breeding pairs, roughly 1,000 years earlier. Ark fail.