[RJT]

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wiki:

"Atheism, in its broadest sense, is characterized by an absence of belief in the existence of gods, thus contrasting with theism. This definition includes both those who assert that there are no gods and those who have no beliefs at all regarding the existence of gods. However, narrower definitions often only qualify the former as atheism, the latter falling under the more general term nontheism.

Although atheists often share common concerns regarding evidence and the scientific method of investigation and a large number are skeptics or humanists, there is no single ideology that all atheists share. Additionally, many atheists are not entirely irreligious; there are atheists who are religious or spiritual despite their lack of belief in gods.

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So unless one knows what a certain atheists thinks in particular, it is kind of like talking to a believer if one does not know if he is a Jew or a Catholic and only knowing that he is a believer in something.