..to some degree, it's just a detail of semantics and/or of word usage.
What you really have in the atheist/agnostic crowd is a bunch of peole who say they have no evidence there is a god (in Andrew Seidel's words, don't know if there is one)
Then, among that population, you have a repartition curve of people according to their degree of belief in the likelihood of existence of some supernatural thingies (god, whatever)
I notice in people preferring to call themselves 'agnostics' a sizable proportion of people expressing thoughts like: i don't know if there is a god, but there might be forces out there that we don't know (as in supernatural forces)
People calling themselves atheists say they are agnostics, but also express a low expectation to ever see evidence of something supernatural ever being presented (that covers rather well the more eloquent ways in which Dawkins or Dillahunty express their 'beliefs')
My two cents.
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