A great short explanation of why naturalism is a more explicative term and atheist and also why naturalism is hard work, but worth the effort ("Naturalists have a lot more work to do than simply rejecting God; they bear the responsibility of understanding how to live a meaningful life in a universe without built-in purpose. ").
http://blogs.discovermagazine.com/cosmicvariance/2012/05/07/the-case…