I’m not sure why you would make this claim.
I would propose that an Islamic state is one where Moslems are the majority inhabitants, where islam is the mandated religion and where sharia is the legal system. By that definition, there are many Islamic states. I would suggest that it’s disingenuous to claim - - and unrealistic to expect that – there ever could be the prototypical Islamic paradise prophesized by the historical figure you revere as a religious figure.
Clearly, people are an incorporation of their religious beliefs, practices and customs. People get their religious beliefs, in this case, Islam, from somewhere. In this case, that “somewhere” is the Koran. I note that the states you claim are not Islamic states certainly do claim that they are Islamic states. Their religious perspectives are inclusive of their behavior, be it for power or destruction or material gains, that people are an integration of their politics and their religions and their traditions and their desires, etc. You simply can’t dismiss the religious connotations to their behavior. I incorporate them (and do so fairly on both sides of the question). These cultures have religion (islam), as their primary motivation so it is fair and accurate to judge islam by Islamic nations.
Curiously, however, folks who have not allowed a monopolistic spirit realm to develop, notably the folks of India and China, largely polytheistic nations, are on the rise. By dint of population, growing wealth, and political influence, their ascendancy portends an altered global mindset as all the gods shall be accorded a place in the ineluctable unfolding of human destiny.
