There may be more than one parallel with Stephen Christman's research work at the University of Toledo, Ohio. He identified a relationship between strength of preference for using right or left hand, musical abilities, and brain development (focusing on hemispheric linking nerves of the corpus callosum). An interesting dimension is that strength of preference was found significant, rather than the simple classification of right or left (see Wolman 2005). Most people have some degree of mixed-handedness, some have extreme strong-handedness. Hypotheses include linking handedness with corpus callosum size, with belief in improbable events, and with revision of attitudes when faced with new information.
I wonder whether one day indicators might be found for recognizing or measuring better developed religious tendencies.
Wolman, David (2005) "On the other hand." New Scientist (5 November 2005) pp 36-39.