Using data from

• http://www.deathpenaltyinfo.org/murder-rates-nationally-and-state#MRalpha
• http://www.city-data.com/crime/crime-Washington-District-of-Columbia.html
• http://www.gallup.com/poll/181601/frequent-church-attendance-highest-utah-lowest-vermont.aspx?utm_source=Social+Issues&utm_medium=newsfeed&utm_campaign=tiles

I calculate the correlation between murder rate and % who attend church weekly is positive, namely 0.35, probably contrary to what Sylvia Allen thinks: AZ Senator: Church attendance should be mandatory
Murders causing people to go to services more often probably does not explain all of the correlation.