I am an atheist. I have no belief in god.
Why is that not an absolute statement?
It is not an absolute claim because of the distinction between epistemology and ontology. There might be a god (ontological statement), but I don't believe it (epistemological statement). But I would never be so arrogant as to declare my humble opinion to be an absolutely true reality. Therefore my disbelief does not go so far as to exlcude the possibility that deities exist.
"No belief" indicates literally zero, which is absolute, just like you have no belief that you are not a woman.
That reminds me, I'm all out of lipgloss!
"There is no god" would be an absolutist (ontological) statement. "I have no belief in god" acknowledges there might be a god but I remain unconvinced by claims for his existance (epistemological).
Saying that you have no belief in a god is also making a knowledge claim, or how else can you arrive at your belief?
By not suspending disbelief. I do not believe in alien abduction stories either, although I do not know for sure. But, like god, claims of alien abduction are (fairly) common. So I ask myself: do I believe this? My answer is no, I do not believe it - that is my opinion. But I would never be so arrogant as to declare my humble opinion to be "absolute true reality".
Does it then follow that atheism falls like every other absolutist ideology, or do you define atheism as non-absolute because it suits your purpose to do so?
That is a false dichotomy. My atheism is neither absolute nor an idealogy (being a mere lack of belief about something).
The difference between me and Christians is the second statement in each of the following examples:
Theist: I believe in god. And I know I am right.
Atheist: I lack belief in god. But he might exist.
"There is a cube of pure gold of length 1cm on the planet Pluto."
Do you believe that?
Do you know for sure?
Unsure, because I have no basis by which to confirm whether the hypothesis is true or not. It is possible, yes, but I don't know for sure.
My answers would be no and no. I don't believe there is a cube of pure gold of length 1cm on the planet Pluto for a second. It's an unsubstantiated and arbitrary hypothesis. But I acknowledge my lack of belief is epistemological not ontological - I could be wrong.
In general I choose not to believe unsubstanitated hypotheses, there are just too many going around. Otherwise I'd find myself entertaining various gods, alien abductions, ghosts, asrtology, superstitions, Nessie and on and on. Yet all or some or none of these things could be real, and this acknowledgement of my knowledge limitations is what stops me being absolutist.
While in external speech thought is embodied in words, in inner speech words die as they bring forth thought.