In order to have a belief in good against evil there has to be two opposing sides. Each side may deem the other evil while painting the picture of oneself as the only good. So religious leaders and followers find atheist the easiest targets in their depiction of good against evil. They may not reveal that all religions besides their own sect are against them. They may reveal that a non believer is their worst enemy. The atheist are the clear or visible non believer. In reality everyone who is not part of their religious sect is a non believer, including those who are part of the same religion.