Is it really an alternative view? Arguably it can be true at the same time, sadly. As LG has pointed out earlier, the meta-analysis was considering only the measure of analytic intelligence, and it has been suggested that there are two other types of intelligence including emotional. In that sense "smugness" can be thought of as falling into one of the other two types, and in those atheists may well fall short. Rather like the idea of good and bad winners, really. Atheists may be on the right side of the debate (I think you said earlier that you were an atheist yourself?), but can go about being on that side in a good way (respectful, calm, measured in making their points) or a bad one (smug, aggressive and rude).