Well depends on what you read I suppose.
"Faith-based prison programs claim to reduce recidivism, but there's little evidence, says FSU research"
http://www.fsu.edu/news/2006/10/04/prison.programs/
"Policymakers across the country are pushing for implementation of faith-based prisoner reentry programming to reduce recidivism levels, but so far studies by proponents and practitioners of such programs haven't produced much hard evidence that they actually work"[..]
Positive claims are often made in the name of religion, usually by the religious, that don't stand scrutiny.