I think there is. (side note - there is no enforced worship in US). Because there is much more than just gun crime... there is suicide, teen pregnancy, and a host of other things.
And how many of those who murdered were Christians vs not religious?
Tougher gun laws? Doesn't seem like that is the key.
"Norway, Finland, Germany, France and Denmark, all countries with heavy gun ownership, have a history of low murder rates. According to a 2014 United Nations report, Germany's murder rate of 0.8 killings per 100,000 inhabitants was identical to Luxembourg, where the law prohibits civilian ownership of handguns and gun ownership is rare [source:
UNODOC,
Kates and Mauser]."
Australia is not a gun ownership country. The right was removed some time ago.
Benefit? Those who do kill, steal, and do other things find their lives changed around when they became Christians.
Remember... there are many people who label themselves religious who later say "I then became a Christian" - that is the problem with surveys.