I don't know if this was the one but it seems like a good place to start.
http://www.humanreligions.info/violence_...#Childhood
http://www.humanreligions.info/violence_...#Childhood
Quote:Imprisonment is linked to both poverty and lower intelligence. These are also linked to religiosity; and in the case of intelligence, low intelligence is a known cause of adherence to a religion. As crime is also linked to inner city populations, and this is also, again, where religion is found to be strongest, it seems that the religious have always been bound to find themselves over-represented amongst prison populations, such as Muslims9 and Catholics