Is there a reason why you put in a series of definitions by which atheism is not world view, Hope?
NS, I did notice once I'd posted that post that you don't regard theism to be a world view either. I would disagree, for the very reasons that these definitions express, thus putting atheism within the same bracket.
Ok, let's take them one by one
world view
1.a particular philosophy of life or conception of the world
Atheism is not a philosophy in any sense nor is it a conception of the world.
the Free Dictionary:
world·view
1. The overall perspective from which one sees and interprets the world.
It isn't the overall perspective from which one can see or interpret the world
2. A collection of beliefs about life and the universe held by an individual or a group. In both senses also called Weltanschauung.
It by defition is not only not a set of beliefs, but isn't even a belief. It's a lack of a belief
Merriam-Webster:
worldview
the way someone thinks about the world
It isn't the way anyone thinks about the world
Wikipedia
A comprehensive world view or worldview is the fundamental cognitive orientation of an individual or society encompassing the entirety of the individual or society's knowledge and point of view. A world view can include natural philosophy; fundamental, existential, and normative postulates; or themes, values, emotions, and ethics. The term is a calque of the German word Weltanschauung composed of Welt ('world') and Anschauung ('view' or 'outlook'). The German word is also in use in English.
It is a concept fundamental to German philosophy and epistemology and refers to a wide world perception. Additionally, it refers to the framework of ideas and beliefs forming a global description through which an individual, group or culture watches and interprets the world and interacts with it.
And again it is a simple lack of 1 belief - it in no sense can be comprehensive.
Theism while at least manging to be a belief isn't comprehensive unless you add on multiple other beliefs.