In a recent debate, Richard Dawkins was asked, and I paraphrase, the following question: agnosticism is defined as being unsure of the existence of god, and you say god almost certainly doesn’t exist, so aren’t you an agnostic, not an atheist? This question reveals rather annoying misconceptions about a number of things, which I shall attempt to address here, partly because they are frustratingly widespread and mostly because it is as good a place as any.
The main idea here is that atheism is the position that god definitely doesn’t exist and that anything else is agnosticism. I want to start by looking at the definitions of agnosticism and atheism. Agnosticism is generally used to mean one of two things: first, the position that humans cannot answer the question of god’s existence; and in this sense agnosticism is entirely separate from atheism or theism. The second perspective is that agnosticism is an intermediate point between theism and atheism, or rather, the position of being unsure of god’s existence. Normally, I would argue that this definition is redundant and incorrect and that we should use the first, but let us assume, for the sake of argument, the second.
What, then, is atheism? Atheism is the lack of belief in god (or gods or other deities). This may seem a simple statement, but all too many people view it as disbelief in god (or gods or… ). If you don’t see the difference between these two statements, let me provide an analogy. Suppose all of humanity was standing out in the rain, and for reasons unknown decided to group together under umbrellas according to their religious beliefs. So we would have the Christians under one umbrella (and all the denominations of Christianity under different umbrellas encompassed by the larger umbrella, which is apparently leaky), the Jews under another, and so on. Where would the atheists be? According to the second definition, they would have their own umbrella; but according to the first, they would be the people under no umbrella. Atheism is defined negatively, e.g. as all the people who do not possess something (i.e. belief in god), rather than positively; as all the people who do possess something (i.e. disbelief in god). This is an important distinction because the first definition includes also passive atheism, that is, lack of belief in god by virtue of being unaware of the concept of god.
Let us now consider the question as asked. It rightly points out that the statement “god definitely doesn’t exist” is fallacious, because it is impossible to prove a negative. Indeed, no one I know would agree with this statement, and certainly Dawkins, a scientist, would not; hence his statement (taken from The God Delusion) that god almost certainly doesn’t exist. What the question then assumes, however, is that any position but “god definitely doesn’t exist” is not atheism but agnosticism. The idea is that even acknowledging the tiniest chance that god exists is enough to make you unsure of god’s existence and thus an agnostic. I will make two arguments against this.
First, by this logic virtually everyone is an agnostic, because the statement “god definitely exists” is just as fallacious as the statement “god definitely doesn’t exist”. Any rational person (and I say “virtually everyone” to allow for the utterly irrational members of the population) would acknowledge that god’s existence cannot (as of yet) be unequivocally determined. But if everyone is agnostic, the term becomes useless; I would argue that it follows that there is a problem with the definition of the term.
But this is a tangential argument. My main point is that acknowledging the possibility that god exists is not the same thing as being unsure of god’s existence. In other words, I think there are two independent scales: the one measuring one’s opinion on the possibility of god’s existence (from “definitely doesn’t exist” to “definitely exists”) and the other measuring one’s opinion on the actual existence of god (from “god doesn’t exist” to “god does exist”, with precious few intermediates). The definition of atheism is relevant to this second scale: if you think god doesn’t exist, you are an atheist, and it doesn’t matter whether you also acknowledge the possibility that god does exist.
To put it another way, I am arguing that the statement “god definitely doesn’t exist” is made up of two opinions, not one: the first being that god doesn’t exist, the second that there is no chance he can exist. Similarly, Dawkins’ statement that “god almost certainly doesn’t exist” is made out of two opinions, the first being that god doesn’t exist, the second that there is a very, very small chance that he does exist. It is the first opinion that makes him an atheist, notwithstanding the second.
Some might argue that I am making a semantic argument, but I wish to point out that the original question is no more semantic than my reply and, if we are being semantic, isn’t it more logical to consider the opinion of a self-identified atheist? After all, a word only has meaning because it is given meaning by us, and millions of atheists all over the world acknowledge the possibility of god’s existence yet remain, in their own opinions, quite firmly atheists.