For many of us, the ongoing carnage in Syria is a self-evident humanitarian crisis. We do not need to be convinced that the children drowning at sea, the women and men, young and old, begging for entry into any country that will accept them are worthy of our help.
Naturalistic and atheistic worldviews have a long history in Western philosophy, but there was no identifiable culture of atheism within Europe until the 18th century. Prior to then, the number of genuine atheists in European countries was probably very small.
19th-century America is increasingly seen as a nation coming to terms with central state authority as a mechanism to support its expansionist ambitions.