Giasi that is very very tough to apply though. By far the majority of people inherit their religion. It is very difficult for many to question something that has been drilled into them from a young age. Even then they will be culturally biased. For example a muslim will in all likelehood have been brought up with explanations of the perils of alcohol and the consequences of using it. A Christian would have their own different prejudices. To break free of that is very difficult. Which is why religion is so firmly linked to background. I doubt very much that the majority of people in Qatar independently chose islam after a reasoned consideration of the other options in the same way that a british christian wouldn't have.