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Philosophers write articles on and have devoted journal issues (French & Wettstein 2013) to the New Atheism, but there is nothing close to a consensus on how that term should be defined.
The fact that there is strength in numbers may recommend a very inclusive definition of “atheist” that brings anyone who is not a theist into the fold.
(Baggini  suggests this line of thought, though his “official” definition is the standard metaphysical one.) Although this definition of “atheism” is a legitimate one, it is often accompanied by fallacious inferences from the (alleged) falsity or probable falsity of atheism (= naturalism) to the truth or probable truth of theism.
Departing even more radically from the norm in philosophy, a few philosophers and quite a few non-philosophers claim that “atheism” shouldn’t be defined as a proposition at all, even if theism is a proposition.
This definition has the added virtue of making atheism a direct answer to one of the most important metaphysical questions in philosophy of religion, namely, “Is there a God?
” There are only two possible direct answers to this question: “yes”, which is theism, and “no”, which is atheism.