Lastly; this is not the case. Society has its checks and balances. Christian or not, to progress and move forward, all societies have set boundaries of appropriate and inappropriate behaviors. Anyone with the belief that they would be murdering were it not for their religion would soon find themselves behind bars; banished; or killed.
Keep in mind, the Christians themselves cherry pick their way through their religious text. They no longer kill people for working on the sabbath. They no longer kill unruly children by taking them to the edge of town and stoning them to death. They no longer kill homosexuals (Unless they live in Africa). They no longer kill witches (Unless they live in Africa.) They no longer practice banishing (Unless they are Quaker, Mormon, Mennonite, or some other obscure sect.) For the most part, secularists have dragged religion, kicking, and screaming, into the 21st century. Hopefully, we have the strength and resources to continue dragging them out of the dark and exposing them to the light of day.