This article looks at the religious beliefs of prison inmates and finds that the fraction of those who are non-believers is almost negligible, far smaller than their numbers in the general population.
In “The New Criminology”, Max D. Schlapp and Edward E. Smith say that two generations of statisticians found that the ratio of convicts without religious training is about 1/10 of 1%. W. T. Root, professor of psychology at the Univ. of Pittsburgh, examined 1,916 prisoners and said “Indifference to religion, due to thought, strengthens character,” adding that Unitarians, Agnostics, Atheists and Free-Thinkers are absent from penitentiaries or nearly so.
During 10 years in Sing-Sing, those executed for murder were 65% Catholics, 26% Protestants, 6% Hebrew, 2% Pagan, and less than 1/3 of 1% non-religious.
Interesting.

