I suspect in order to understand your definition of atheism you also need to provide a definition of god...
One big problem is the number of different beliefs far exceeds the limited number of words defined (for just a few of these beliefs).
We are members of Sierra Nevada Cathedral - one of the largest, longest and tallest churches in North America. It has the largest "stained glass windows" in North America. We visit the church as often as possible in all seasons. When I mention this, the usual response is that a person has never heard of this church. "How many members do you have?" More than 2 million. They remain puzzled.
I prefer worshipping at the Divine Canadian Rockies myself, but I'll be sure to join you next time I'm in the neighbourhood.