I have posited many times that religions merely reflect the societies & cultures in which they are observed. If Islam didn't exist, the ME would just create (or modify) another religion that manifests itself in the pathological behaviour we see today, including a cartoonish emphasis on male dominance, female subordintion, paranoia and failure.
The problem isn't Islam, it's its practitioners. Perhaps our greatest weapon against extremism will be discovered via gene therapy.
God didn't plan it that way and it'll never happen. Mankind doesn't have the power whatsoever to completely eradicate greed, covetousness and evil from this planet which brings about many of mankind's ills. All of us being human with our own uniqueness, will from time to time, make mistakes. Results of those mistakes are cumulative over time and results are what they're going to be. The variables are mind boggling from the perspective of 'a controlled experiment'. As humans, we can only strive to make small improvements along the way and hope for the best for all of us and deal with the undesirable results from our own mistakes.