First before I get accused of plagiarism this thread is a copy done from memory of a write by William Craig, a famous Christian apologist. I couldn't find the original article which contained much more information. I will cut and paste the article if I ever find it.
Well the definition of atheism is difficult or easy depending on the emotional make up of the atheist one asks to define themselves. (lol, I used the word emotional as a substitute for psychological make up. Its an friendly in house sarcasm).
The big question is atheism a view or a psychological condition? If atheism is taken to be a view, like the view that there is no God, then atheists must shoulder their share of the burden of proof to support this view. What about the atheists who freely say that they cannot sustain such a burden of proof? Those guys attempt to shirk their epistemic responsibility by re-defining atheism so that it is no longer a view but just a psychological condition. And psychological conditions can make no assertions. I agree with Craig who says these self named atheists are really closet agnostics who want to claim the mantle of atheism without shouldering its responsibilities. Don't ask me why I know that is true!
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I strongly disagree. Getting a reasonable definition of the term 'God' out of theists is almost impossible. Without that, how can anyone say whether they believe or not? Then, and partly because of the range of possibilities, it is quite possible to believe in some things people label as 'God' and not in others. For example, I certainly don't believe the Christian deity exists. Nor the Islamic one. But a pantheistic deity that iified with the universe? Well, I certainly believe the universe exists. But I am not so convinced that the universe deserves the noun 'God' applied to it.
I also disagree because the of proof is on the positive existence statement. The default position is, and always will be that something doesn't exist until it is proven to exist. because of this, the lack of evidence in a deity *is* quite sufficient to match the claim of non-existence. If I claim that a new species of large mammal exists, but fail to provide proof, the claim will rightly be ignored. if I claim that a subatomic particle exists but fail to provide proof, the claim will rightly be ignored. And in the same way, a claim of the existence of a deity that does not support that claim with clear evidence should be ignored as simply being an unsupported claim.
BTW, Craig, while a very popular apologist, is a very poor reasoner. His claims about infinite regress being impossible are another example of his failures.