I'm a bit confused by this. I thought that the Noah story was one of the ones we were supposed to take metaphorically?
no you are not to take it metaphorically if you do, you would be calling God a liar.
I think we make ourselves look really stupid by saying that the Noah story is real and present atheists with a real opportunity to argue that the Bible is just wrong.
the preaching of the cross is already considered foolishness by the unbeliever, should we stop preaching that as well? it is better looking foolish for God than smart to men.
After all, it's taken as a given that the flood did not happen in the way that it is suggested in Genesis
no it is NOT taken as a 'given'. only those who do not believe God or refuse to accept what was written think so and those same people rely on physical evidence (or the lack thereof) to draw their conclusions. God did not say to rely on physical evidence He said to rely on faith.
there is so much information and questions that could be posted here to help you reconsider but space is very limited. Hapgood records much evidence for a global flood in his book Path Of The Poles but he doesn't refer to it as such, one just has to look at the evidence he re-records and compare with the Biblical narrative and one will see the that there actually is physical evidence to support a global flood as recorded in Genesis.
and to suggest that Noah could collect a stock of every single animal in the world is just ridiculous.
Noah did not have to stock every animal, only kinds which reduces the number immensely. if you learned anything about genetics you would be able to apply the concept of 'information losing' to the whole scenario and come to a rational, scientific conclusion for the diversity today and the lack of animals noah actually needed to preserve.
Noah was a man...how do you expect him to have collected and preserved lions and wasps and rabbits and hyenas and bluebottles and whales etc. etc.
see above and water animals were not placed in the ark, read the list again to see what God wanted preserved.
Surely we'd be better off accepting that the Bible is not a historical document in this case or am I missing something?
you are missing something and do not apply all the facts to the issue but rely on a limited grasp of the situation. you are also forgetting that the geography was not the same then as now, you are forgetting about genetics, and most importanty you are forgetting about God.
God can do anything so if you dismiss the story because humanistically it doesn't work then you are saying God is not god at all but unable to do as He said in Gen. you might as well throw God and the Bible out the window then and forget about being a christian because you are defeated and have nothing to stand upon.