Figuring out the answer to that question is no doubt a daunting task, but Gallup polling took that challenge and has released the results of their world-wide survey that began in 2009.
One might hypothesis that the most prevalent differences in culture can probably best be seen between Eastern and Western cultures, which often times causes huge culture shocks. If you take a close look at the color coded results mapped out (by Max Fisher from the Washington Post) you will notice that this does in fact seem to be the case.
The Contra Costa Times has outlined the results of that study.