Just an idea: you create the meaning. You see what you choose to see, when it comes to seeing "meaning."

Huh, interesting. Why is the Qur'an then superior to the Bible, the Epic of Gilgamesh, Tintin, or a blank piece of paper?

Well, "superior" has a lost, unspecified standard. I've never encountered anything else like the Qur'an. It claims that it is not the first "message", and I can see traces elsewhere. However, the best alternative mentioned above is the "blank piece of paper." If you can receive the message in a blank piece of paper, you would receive the message in all the rest.

I could justify this statement from the Qur'an itself.

Also, how do you know that you accept the Qur'an, rather than just projecting on it what you already believe? Or is there no difference?

Setting aside issues with "believe," there is no difference. You could say that the Qur'an is a mirror which shows me, if I pay attention, what I know, or think I know.

Yes, there is a danger. However, if the basic message is accepted, if I stick with the blank piece of paper, and don't believe anything that is not on it, I won't actually create persistent error.