The origins of football (that can be historically proven) date back to 200-300 years before Christ. I'm pretty certain we have 0 measurable ways to compare enthusiasts, amateurs and professional players in this 2200-2300 year timespan.
I'm also pretty certain that we have 0 measurable ways to do it in the last ~100 years since professional football has taken its place as king of sports.
Perhaps we could cover the past 20 or at most 40 years, but even 40 is too much, the data from a footie game in 1982 and in 2022 is vastly different and the memories of a 12yo in 1982 vs now 52yo are not reliable either. We could do massive polling of fans or put together a group of esteemed experts + analysts, maybe that could provide something tangible, but that could cover only a few decades at most. Greatest of all time? Can't be done, that title shouldn't exist.