If you wanted to scientifically study the effects of alcohol consumption among groups, you wouldn't take 5 people from one neighborhood, of one ethnicity, of on

If you wanted to scientifically study the effects of alcohol consumption among groups, you wouldn't take 5 people from one neighborhood, of one ethnicity, of one level of education, etc. and 5 people from a different neighborhood half way across the country of a totally different background, living under different circumstances, assign one group to drink, and call it a sound experiment. Similarly, alcohol consumption is not the only differentiator between Muslim and non-Muslim countries.