Why are atheist...atheist?

[Oldandeasilyconfused]

All evidence points out that supernatural being A does not exist,

Sorry to be picky,but no,it does not,unless there have been new discoveries in the last few days I haven't heard about.

That is why I and every atheist I know asserts "I do not believe in God(s) due to lack of credible evidence"

There is no credible evidence one way or the other.

I'm with Dawkins,my disbelief 6.9 out of 7. I am unable to assert certainty.

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I believe there is no god.

That is a positive claim, called 'hard atheism',in making the claim, you attract the burden of proof. Your argument is a logical fallacy, called argument from incredulity, a form of argument from ignorance.You really have no idea, do you

What puzzles me is not why anyone of intelligence is an atheist, but how anyone of intelligence can possibly believe in any particular one of the myriad fictitious stories upon which the various religion

Same again,argument from incredulity (and an ad hominem).

Bored now.

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Argument from incredulity/Lack of imagination

Arguments from incredulity take the form:

P is too incredible (or I cannot imagine how P could possibly be true); therefore P must be false.
It is obvious that P (or I cannot imagine how P could possibly be false) therefore P must be true.

These arguments are similar to arguments from ignorance in that they too ignore and do not properly eliminate the possibility that something can be both incredible and still be true, or appear to be obvious and yet still be false.

The other basic fallacy implied in your argument;

If a proposition has not been disproven, then it cannot be considered false and must therefore be considered true.
If a proposition has not been proven, then it cannot be considered true and must therefore be considered false.

http://en.wikipedia.org/wiki/Argument_from_incredulity