Yeah, it's a knotty problem LOL. There is what people mean when they use words Vs. what those words actually mean. A lot of people use words and claim labels wrongly, sometimes as an acceptable disguise for a less acceptable viewpoint.
A typical, and related, example is 'skeptic'. Lots of people claim to be 'skeptics' who are not skeptics at all, they are 'pseudo-skeptics', active deniers, they have active disbelief and assert negative claims ("X is false"). Whereas again, a truly skeptical position is agnostic ("X is unproven").
Commentaries: On Pseudo-Skepticism
Likewise, there are 'pseudo-atheists' and probably 'pseudo-agnostics' too, either through ignorance or by design.