I'm sorry for the lack of imagination regarding the title of this question but it sums up pretty much the main idea.
I would like to know if there is an event (or many events) on which it could be really difficult to lie or twist some facts in the Holy Quran that prove that the Quran is truly the word of God.
Ok, I know it's not clear enough so let me show you one example of what I mean by that.
In the Torah, the fact that more than two millions people witnessed God speaking is one strong point:
On the fiftieth day after they began counting the Omer--that is, fifty-one days after the Exodus, all of the Children of Israel, men, women and children, over two million people, stood at Mount Sinai and received the Torah amidst great miracles and heavenly fire. They saw no form or picture of G-d, but they saw many miracles that proved that G-d is the Creator of heaven and earth. They heard G-d's voice speak and command Moses to instruct the Children of Israel on how to prepare to receive the Torah. Then they heard G-d speaking directly to them, the Children of Israel, and commanding them to keep the Torah. The Children of Israel accepted the Torah and all its Commandments, and they said: "We agree to obey, even before we hear the actual Commandments."
Since there were millions of people it would have been difficult to elaborate a (complex) lie with all of them and then spread it after. We are speaking of millions of witnesses.
There are also all the prophecies regarding the Jewish nation that have been fulfilled: diaspora, hatred and persecution, survival of the jews away from their homeland, return of the jews to their homeland, Jerusalem will become an international problem, etc.
Does the Holy Quran has such events or strong points to rely on? Because in the end we should rely more on knowledges than beliefs.