Is atheism a belief?

[Bucky Ball]

Not at all specific enough. "God" is never *defined* in the Bible, (if you think it is, show us where). A completely coherent definition is not only NOT there, but also impossible. 

It's sufficiently defined to state gnostically that it's an incoherent description.  You can positively assert that you do not believe that God, as depicted in the Bible, can possibly exist.

When I say not specific, I really mean not specified.  If someone says, "Do you believe in god?" a natural enough question is "Which God do you mean?"  I don't think you'd ask a Biblical Christian that.

No.
It is insufficiently defined, therefore as it stands in its insufficiency, it is incoherent.
In fact, ANY god which "exists" (ie possesses the property of existence) is incoherent,
as it necessarily HAS to be embedded in a larger Reality, which it could not, therefore, have created.

I would ask a Christian who claims to be "Biblical" that question.
Not only is the divinity of Jesus different in every gospel, the Hebrew "heavenly host" in the OT contains ALL kinds of divine beings, and in fact the Hebrews in the OT worshipped a number of gods, including the Babylonian war deity, Yahweh Sabaoth, and his wife/consort, Ashera.