Note that I don’t define atheism as being able to prove that Gods do not exist, merely that one thinks that Gods not existing is the most likely position.
I think if atheists were really serious about insisting that atheism is merely a lack of belief in Gods, then they would be careful to distinguish between that position and positions that claim more. So for instance under that definition of atheism, as I said Richard Dawkins is not an atheist. He does not merely lack a belief in Gods, he positvely affirms that Gods almost certainly do not exist. So his belief is something of a post-atheism or a meta-atheism if you will. If one simply lacks a belief in Gods it does not follow from that position that theism is wrong (ie: that God does actually not exist) or any other number of positions that typically are argued by atheists. The claim that atheism is best defined as a simple “lack of belief” in God is quite simply undermined by atheists themselves refusing to stick to that definition.
This is simply an irrational abuse of logic. There is no such thing in logic as a logical default or a null hypothesis. Either one has reasons to believe in a proposition and/or it’s negation or one doesn’t. Otherwise you place yourself in the position of saying that logical statements are inherently conditional and objectively meaningless. Take for instance the proposition that “I have a cup of coffee”. Right now you have no evidence for my cup of coffee, so by your criteria you must logically conclude that my cup of coffee does not exist. Then I take a photo of my cup of coffee and send it to you, thus providing you with evidence that my cup of coffee exists. You would then have to say that my cup of coffee exists. The intersting question though is did my cup of coffee exist in between my initial claim of it and my providing you with evidence? If we take your view seriously, that statements can only be true if there is evidence for them means that you would have to say that my cup of coffee literally did not exist until evidence for it was provided. And that at that point the cup of coffee came into existence because the truth value of the statement “my cup of coffee exists” changes for you at that moment.
Obviously such a view is absurd, and so I think so to is the idea of the “logical default”. I think you must be confusing confirmation theory with general logic. In conifmation theory one has a test hypothesis and a null hypothesis, but you also necessarily have a test that enables you to distinguish between the test hypothesis and the default hypothesis. Before the experiment is conducted it is not known whether the test or the default hypothesis is correct. After the test there is necessarily evidence that will confirm the test hypothesis, or the conspicuous lack of necessary evidence confirms the default hypothesis. Without the test the default hypthesis has no real meaning.
This is circular reasoning. The problem is that evidence cannot be evaluated in an ideological vacuum. If you start off holding to a naturalist worldview then simply no evidence is possible for the existence of God because all evidence of God’s existence is necessarily fake. So what ends up happening is that you adopt an atheistic worldview as a kind of default. And then you judge evidence for other worldviews from that position and find it invalid, because it is inconsistent with your current worldview. So you end up in a position where you are an atheist because there is no evidence for God and there is no evidence for God because atheism is true.
I think it is one of the glaring philosophical mistakes of the “new atheists”. Evidence is not as objective as one would like it to be. Everyone requires a worldview as a basis to evaluate evidence, and that worldview affects the way in which we view evidence. This is, I think, one of the important contributions of post-modernism to the debate. I think we need to recognise that evidence is not entirely objective, and therefore refusing to consider different worldview positions until they are “proven” is simply a circular re-inforcement of your own worldview.
Calculon.