Is it logical for a Theological Noncognitivist to identify as an atheist?

[robvalue]

Atheism can also be defined as "lacking a belief in gods". By that definition, we are certainly atheists.

The prefix a- means without, or lacking, right? It's not an active position (as I see it) it's the lack of another active position. Of course it can optionally be made into an active position.

That's how I see it, anyhow. But as Pyrrho says, it comes down to exactly how you define words. Probably 75% of people in the world, including many atheists, don't even understand what atheist means anyway. (Atheists denying they are atheists, for one thing.) So I wouldn't worry too much, atheist is a good enough description for almost any conversation. Only when your discussion partners show a detailed understanding of the subject will it become necessary to clarify.