No it's not. Even non Muslims admitted that we Muslims have the right to be proud of it. There's nothing else anywhere like it, secular or non secular texts.
> Historians are usually honest
Our Muslim historians even more so.
> And if some historical text talks about miracles, something which cannot be explained with rational thought and to the best of our current knowledge
Or that God bent the laws of our reality to make a point. Not everything is explainable by logic, especially when we see such events take place thousands of years later in our lifetimes today.
> So if he can do it then I can with equal right assume there were many tries, no?
No, because his claim is that there is a creator, whereas you're just making a claim that has no basis in your secular materialistic world view.
> Now if I give you my own opinion then I would say there is zero reason to make such assumptions
We exist, so there had to be a starting point. We have evidence that people came and claimed to be sent from God, and we proved their claims based on many things (their character, miracles, etc). The Quran to this day stands as a living miracle, and its challenge is up for anyone to take (many centuries after everyone tried and failed).
These things remind me of how new atheists are flimsy with their arguments https://www.youtube.com/watch?v=rn7n-gff-0c
Now if I give you my own opinion then I would say there is zero reason to make such assumptions and therefor we cannot deduce anything about how many tries there have been, when the first try was, if there even exists time outside our universe or what other rules apply or don't apply. It's all thought experiments. Thinking that the idea of god was there and just willed the universe into existance is a thought experiment just as valid as me claiming a pink machine prints universes. I cannot prove that and you can't disprove it. It's a stalemate. I admit that fact while you are 100% sure of your point of view. And since you are so keen on relying on history: history tells us people that had your point of view eventually were proven wrong.
Like you said, all those things including your claims are metaphysical theories. They are not facts.