What is Atheism?

[Neo-Scholastic]

By redefining atheism as a "lack of belief" you mean non-theist and as such now encompass all the positions other than theism (atheists, agnostics, verificationists, babies, the impaired, my dog, and park benches). So 'atheism' ceases to have any meaning pertaining to a view of how the world is and simply becomes a psychological state.

Indeed. It trivializes the word.

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Well...that's because atheism isn't a way of viewing the world...it's literally one response to one claim.

Deliberately excluding the divine from consideration limits how you allow yourself to see the world.