Why didn't Islam bring the best out of the people? i.e why didnt Islam make Muslims successful in all the aspects of life?

I get answers like "Look at Golden Age" but isn't Golden age a cause of Greek Philosophy and not Islam? I dont understand why Islam takes credit for it can someone elaborate? What in the religion of Islam would cause such a development? Even if it has caused the Golden age, isn't it just a speck of time in a huge 1400 years of timeline where vast majority of time Muslims lived miserably or comparatively worse than Kuffar? Why would God create a Religion when he knows his system of life would make life miserable ? In no way I'm tryna throw shade on Islam, as a revert I am hopeless and Im not finding answers anywhere. I dont find the scholars of Islam as much of a thinkers.