he atheist rejects the claim that there is a
supernatural entity or force that interacts with existence...
Because it is a claim without basis.
Atheism makes no claims whatsoever.
Atheism asserts nothing.
Atheism IS NOT an act or an action
IT IS a position
It has no objective.
Comparatively / Conversely:
Anti-theism IS an act or an action
It IS NOT a position
It has an objective.
Not all ATHEISTS are ANTI-THEIST.
All ANTI-THEISTS are ATHEIST.