The Quran does not force Muslims to defend a global flood carrying millions of animal species. Its wording centers Noah's warning and the punishment on his people, while leaving some physical details unstated.
The strongest form of the objection
The criticism is not silly. If someone claims the Quran teaches that all land on earth was underwater at once, and that every biological species entered one wooden ark, then critics will ask for geological evidence and for a workable account of how such an ark housed and fed them all. Those are fair questions against that specific claim.
But that claim often depends on details taken from later storytelling, Israeliyyat, or weak reports - not from the Quran itself. The Quran gives a moral and prophetic account: Noah warns, his people reject, Allah saves the believers, and the deniers are destroyed.
How the Quran frames Noah's flood
And We certainly sent Noah to his people: "Indeed, I am to you a clear warner."
Quran 11:25
Indeed, We sent Noah to his people, saying: "Warn your people before there comes to them a painful punishment."
Quran 71:1
This repeated framing matters. Noah is sent to "his people", and the judgement falls on the rejecters among them. The Quran does not pause to map the flood's geographical extent. It is not written like a geological report. Its concern is guidance: revelation was denied, a prophet was mocked, and Allah's promise came true.
Some classical scholars understood the flood as worldwide, often reading the text together with inherited reports. Others noted that the Quranic wording itself does not require us to define the flood by modern categories such as "global" or "regional". The Arabic word "al-ard" can mean the earth, but it can also mean the land or territory under discussion, depending on context. So the text allows more than one reading of the flood's scope.
"Of every pair" does not mean every modern species
At length, when Our command came and the oven overflowed, We said: "Carry in it of each pair two, and your family - except those against whom the word has already preceded - and whoever has believed." But none had believed with him except a few.
Quran 11:40
This verse is often made to carry more than it says. It does not mention every species on earth. It does not list insects, birds, reptiles, marsupials, polar animals, or all modern taxonomic categories. The wording can naturally mean pairs of the creatures Noah was commanded to take - the relevant animals needed for survival after the flood, or the animals present in that setting. In Arabic, words like "every" can be context-bound, as in ordinary speech: "bring everything" rarely means bring the universe.
So the impossibility of fitting millions of species on the ark is not an impossibility created by the Quranic text. It is created by adding assumptions to the text and then attacking those assumptions.
What this answer does and does not prove
This answer does establish that the Quran itself does not explicitly require a worldwide flood or the boarding of all animal species. It also establishes that Muslims are not obliged to defend later legendary details simply because they became popular in storytelling.
It does not prove, from the Quran alone, the exact size of the flood, the ark's dimensions, the number of animals, or the full natural mechanism by which the event unfolded. Those details are not the point of the passage.
The safer reading is to stay with what Allah revealed: Noah preached to his people, a devastating flood came by Allah's command, the believers were saved, and the rejecters were destroyed. Where the Quran is silent, we should be careful not to turn speculation into creed.