Why don't some people understand lack of belief?

[Amarok]

Yes, because those imaginary distinctions make atheism a trivial position.

It's far from imaginary and far from trivial 

 Nobody cares if you're 20% or 80% certain that no God exists. 

Then those people are not very bright  and why should i define position by what others think ?

The issue isn't certainty.

Yes yes it is . It's not to you maybe but who cares about that ?

It's whether or not you are willing to commit to a stance despite the various uncertainties and vicissitudes of human existence.

Nope it weather your justified in making said commitment . If not best not .

And your analogy sucks as your lunch date is not an existential claim about the existence of something so i won't bother refuting it . You once again failed to refute the position just mock and whine about it

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if doubt is need to test certainty, certainty will have to grow.

It is  needed 

To settle for doubt and ignorance... I don't see merit in that.

To settle for reasonable doubt is a merit 

I don't see, has never been proof of a proof not being true.

No but a good reason to doubt a claim 

Mere denial of evidence never been proof evidence should not be convincing.

You call it denial reasonable people call it . You having zero evidence and them not accepting you claim based on it .