Testing the strength of your Atheism

[Alex K]

You make it sound like there are no degrees of certainty concerning atheism? That's probably not what you are trying to say...?

That's exactly what I'm trying to say, if there is any degree of uncertainty, you would be agnostic, no?

Yes and No. Very important false dichotomy. Everything in life, and especially science for that matter, comes with degrees of belief.

An atheist is someone who has, for all practical purposes, come down on the side of not believing, ideally after deliberations due to lack of evidence. Depending a bit on which deity we are exactly talking about, and assuming a sensible definition of its properties, it is rarely sensible to claim absolute 100% certainty that there is no such God, as this would be dogmatic and unscientific.
The remaining % may be extremely small, but usually not 0. Hence, most atheists are agnostic atheists. Some claim that no sensible and consistent definition of God as been brought forth that would even deserve discussion (hello rob) which is not an entirely absurd point of view. Very few however will claim that they have possession of the absolute and unalterable truth that there is no sort of God, however defined. Key is here that God is treated as a very unlikely hypothesis among arbitrarily many others, such that it can be safely dismissed for all practical purposes despite the technicality that there cannot be proof in the mathematical/philosophical sense that no trickster God exists in hiding.