@jno
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Lack of belief might also include agnosticism.
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Someone on The Big Questions gave a very convincing explanation of (his) agnosticism. I can't recall the details or reproduce the words so the below is only what's left after I've processed it: -
i) It is not possible to prove God exists: there is no measurable physical evidence.
ii) It is not possible to prove God does not exist, as it is impossible to prove a negative.
To a logical mind, the only realistic conclusion, arising from considering (i) and (ii) is "I don't know whether God exists", or even "I *cannot* know whether God exists".
In general, they go around, holding this view, all the time open-minded, on the lookout for miracles or other measurable signs…
Hence I think of it as non-committal, or fence-sitting, if I want to be unkind about it.