For instance, how was intelligence defined and measured? Intelligence was defined in this study as the capacity for analytical thought, problem solving, and the understanding of complex ideas. The studies, which included a life-long analysis of the beliefs of 1,500 gifted children with IQs over 135, showed fewer religious believers among the gifted than in the overall population. Additional studies corroborated that religiosity tends to decrease with increased educational level. For example, only 7 percent of the members in the National Academy of Sciences believe in a personal god.
You could argue that the studies might be flawed for a variety of reasons, which include ignoring emotional intelligence and other worthwhile qualities that can contribute to a high quality of life. However, religion aside, I think most people believe that scientists (and even mathematicians) are smart. The cliché, “You don’t have to be a rocket scientist to figure it out,” means you can do it even if you’re not that smart.
But I’d rather let others discuss the relationship between religiosity and intelligence.
I’m more interested in perceived character flaws of atheists, perhaps related to intelligence. Some atheists come across as arrogant and smug when they gratuitously criticize and even mock religious beliefs, occasionally quoting ludicrous biblical passages to those who don’t interpret the Bible literally. Yet I can make a case for ardent atheists being more humble and open to change than religious fundamentalists, illustrated by the T-shirt phrase: “Will Convert for Evidence.” Richard Dawkins, the world’s most famous atheist, supported a bus ad campaign with the relatively humble slogan, “There’s probably no God.” I’ve yet to see a comparable religious ad that says “There’s probably a God.”