For the many wars that have been fought, yes religion has something to do with it. Let me give you a few examples:
In 16th Century, Protestant vs. Catholics ~ Wars of Religion (
French Wars of Religion - Wikipedia, the free encyclopedia)
17th Century, Catholics vs. Calvinism ~ Thirty Year Wars (
Thirty Years' War - Wikipedia, the free encyclopedia)
Indo-Pakistani Partition in 1947 (
Indo-Pakistani War of 1947 - Wikipedia, the free encyclopedia)
I don't need to mention the killings brought about by the Inquisition; I don't need to mention the deaths brought about by the Reformation in Germany and nearby regions; I don't need to mention the wars being wage against the "infidels" by Muslim extremists; I don't need to mention the war waged against the Dalai Lama by the Chinese government; I don't need to mention the deaths brought about by the religious war in Northern Ireland and so on...
About the criminal stats, all I'm saying is that one cannot be safe even if the person is a god-believer. Another insight that we can glean from the same stat is that -- it seems that atheists are more law-abiding than believers. If you talk about danger, stat-wise, you are likely safer with atheists than a self-declared god believer...but stats are just stats...it can never be 100% reliable, but it's a good tool nonetheless for decision-making.
It makes you wonder that if believing in God would make us a better person, the behavior of many god-believing people tells us otherwise.
