Going to church does not make you less likely to commit a crime. Heck leading a church does not make you less likely to commit a crime (or commit a sin if you want to call it by its church name). I’ve known that stats show a correlation between high religiosity and higher crime rates for some time now. It is nice to see a Christian talk about it.
Perhaps people who go to church commit sin because they believe they can always repent in the end and God will forgive them later? Perhaps "Church" attracts people looking for "salvation and forgiveness" yet struggle with giving up old "behaviors and coping mechanisms?" Perhaps it's nothing more complicated then "Church" breeds snobbery, exclusiveness and hypocrisy. Christians just do not always practice that which they preach. It would be too expensive and require a lot of self control. After all, they're only human.
So why is it those Europeans have less instances of violent crime if they life without God in their lives? Oh, that’s right, it is because there is no link between being a Christian and moral behavior.