What percent of the world believes in hell?

I don't see how a meaningful figure could be worked out - especially as the term uneducated is open to a range of interpretations. Does it mean did not cover it in school or does it simply mean uninformed? Moreover, which country or countries does the question refer to? The US, the English-speaking countries, the German-speaking countries, the world? One would also need to specifcy the age-range(s). For example, I doubt if many over 50s covered the subject in school, but that doesn't mean that they are uninformed. Having said all this, I would be surprised if there were no statistics available for coverage among current school leavers in the US.