I'm sorry, but it seems you're the one who lacks the knowledge. The idea of I'jaz is deeply entrenched in Muslims culture, and was the major force behind Al-Ghazali's influential Quranic Science movement that crippled the scientific establishment in the Muslim world in the 13th century. Muslim clergy continue to call themselves "the men of knowledge" to this day. Ibn-Qutb, a more recent Muslim philosopher, re-ignited opposition to scientific pursuit by arguing that "Western" science is an affront to Islam, and that Muslims must trust the Quran's proclamations.
To me, i'jaz means uniqueness, the fact that the Quran is inimitable. To my imam, I am certain that it means the same thing, since we recently went over this concept. It is simply a testament that no man could have written it, and the advice of the surah's should be taken to heart, and that no man-made intervention has been made. To you, the idea of i'jaz seems to mean that (correct me if I'm wrong) the quran is one entire scientific revelation, and that every single event, story, surah is a metaphor for another scientific revelation; coupled with this claim, you say that this is "common knowledge amongst even the laymen" and that inherently, science and islam cannot co-exist. Again, you sharing this view is quite comical to me to say the absolute least; my reluctance to dispute with you is because to me, there aren't many reasons to try and educate an individual who has come up with these preconceptions, not say where he got them from, and spew them forth in a very brash manner, as opposed to asking about a topic he likely doesn't know very much about.
Also, its funny how you attribute the ENTIRE decline of the islamic golden age of science to Al-Ghazali. Please offer some critical sources that shed some insight on this; because, I am finding this claim amusing to say the least. You then name one islamic philosopher, Ibn-Qutb, who has a certain viewpoint of islamic science, and you use the viewpoint of ONE muslim to then blanket 1.1 billion other peoples opinions. Tantamount to me hearing the opinions of one crazy evangelical priest, and tieing that generalization with the rest of christianity. Swing and a miss, siromar.
Muslims argue endlessly that verses of the Quran, such as the ones describing things like embryonic development, are proof of the Quran's scientific inerrancy. The complaint about "blanket statements" tries to disarm the argument by pretending that since not every single believer acts that way, the phenomenon must be irrelevant. But it is not. I am compelled to simply debate the merits of one's beliefs, not how to avoid issues that make one uncomfortable.
As for my comment about Muslims claiming that Quran is best understood in Arabic; that is a fact. Muslims often say that. It is not even controversial. The rest of the statement is just opinion. After all, reading Quranic Suras like "Al-lahhab" sound impressive in Arabic. The Quranic language is archaic, and thus inherently mystical and intellectual-sounding. But if you actually try to understand the meaning of the sura, it is simply saying "Damn that man Abu Lahab. Does he think his riches will preventing him from burning in hell? No! He will burn. And that evil wife of his will feed the fire that burns him." Now it sounds less like the word of god, and more like Mohammad talking about how much he hates some random person.
Its true, the Quran is without a doubt best understood in Arabic. It is the initial language that it was recorded in, thus every other translation inherently has an element of man-made revisions subject to it. I don't understand why you're making this a big deal; this allies to biblical translations as well.
So if you're trying to understand the meaning of any surah of the quran, it basically boils down to mohamman ranting on about how much he hates people? Siromar, how about you give us a bit more context in that "quote" you chose to show your biased views of the quran?? How about you post that surah for everyone to see, and see if all we derive from it is: Mohammad hates this guy, and is just ranting about it. Again, I'm curious. How did you educate yourself over these viewpoints of the Quran??