Atheism as a belief system

An FB post noted that no atheists have organized terror or jihad based on their belief system, to which I commented the following.

Valid point. But atheism isn't a belief system. Just the opposite; it's a considered working empirical conclusion based on the foremost principles of empirical science; skepticism and adoption of theories only after falsifiable test, OR when that's infeasible, substantial cross linked evidence that strongly disfavors alternate hypotheses in comparison (as in cosmology, where lab experiments aren't possible).

Any serious consideration, without a priori postulates, of the hypothesis of an active, conscious God capable of and engaging in changing events in the physical universe, will have to conclude that there is no consistent evidence for the existence of such a being. People are free to believe whatever they like, but there is no REASON to adopt this belief based on the only reliable method we have for testing truth claims; the scientific method. Indeed, the hypothesis that God-belief resembles other forms of wishful thinking found in the study of human psychology, finds considerable support.