Secular society has laws against crime, theft, accusation, treachery and lying, the care of children, and the state cares for orphans.
As far as the rest go, many things are counter-intuitive, and secular states have learned through real world examples why putting prohibition into the law of the land for example, does not work.
I acknowledge your point that it is good to have positive role models, and so long as they are not presented as real historical narratives, the role models of the Quran are fine for that.
I also acknowledge that it is fine to have laws such as prohibition of alcohol, gambling etc as part of personal honour codes, they only become a problem when they are inserted into the law of the land. Which brings us to the problem of the Quran which is that it purports to be the correct foundation for the law of the land.
I don't think the gangsterism that ended Prohibition and the idea "Why shouldn't we officially profit from taxable intoxicants that lead to tons of cases of crime, domestic abuse, car accidents, addiction instead of the criminal black market?" really applies to the important aspect of making it seem like a religious prohibition rather than a secular and arbitrary seeming one. The seriousness with which the idea of it being madeca religious taboo adds an element to it that is lacking otherwise. Under Islamic style mentality, Capone and other gangster scum selling drugs illegally would've simply been mass murdered, they were userers too (profiting from high interest loans), having them weave and wind their way through impotent legal proceedings instead of just getting murdered and preferably thrown in a pit and burned like they deserved.
The legal system also is blocked from interfering in a lot of ethical issues which would be shunned by society and have legal consequences as well, such as the kind of society produced by drunken sexual liaisons and children born and breaking up and cheating and pre-marital relations and all that.
For myself though, I don't think an Islamic or Qur'anic system is possible or feasible since corrupt psychopaths always pursue and sneak into positions of power and corrupt systems. So, ideal for me personally is some kind of socialist style hybrid government that I can rip off and seek benefits from and protections from which is otherwise non-invasive, I never hear from them or they from me, we leave each other entirely alone, and I can freely enjoy whatever I wish or like, and practice my strange pleasures as I wish without anyone watching or caring. The only problem is when I'm crammed in with other scumbags and their trashiness and forced to tolerate them when I'd rather they drop dead. In that case I enjoy things like drug overdose epidemics and whatever, since I've watched drugs, drug users, drug dealers and thugs destroy numerous peaceful communities and terrorize the elderly and everyone without the police able to do much of anything about it. It really sucks.