I love religion!

[Tiberius]

If your atheism denotes that "there is no god" is an absolute and "ultimate" truth, and that you get some form of meaning from that, then you are being religious.

I don't see how you can be agnostic and claim some ultimate truth about the existence of God though. The very point of being agnostic is to claim this knowledge is unknown or unknowable. If something is a truth, it is known by definition...

But I'm not talking about my views.

I'm merely speaking in the abstract, as how atheism could be seen as an ultimate truth.

If some theist comes to you and argues how atheism could be seen as an ultimate truth, then you can easily argue the opposite, pointing out the err in their definition of the actual word. Atheism makes no truth claims. It doesn't even come close. Atheism isn't defined as "the view that there are no gods" but rather "the belief that there are no gods" (or "the disbelief in the existence of gods"). Theism likewise does not espouse an ultimate truth, but a belief in an ultimate truth. Theism no more says "God exists" than atheism says "God doesn't exist". It's all about belief.