Is Atheism a Belief-system?

I came across the above episode of “The Late Show” in which the presenter Stephen Colbert interviews the famed British entertainer Ricky Gervais, who also happens to be an atheist. In the interview he declares that atheism is “not a belief-system,” which is a rather disingenuous comment. So I sent him a message by Twitter and asked him if he believed in God or not, to which he did not reply, so I will have to answer it for him myself. There are three possible answers that he could give to that question: “Yes,” “No,” or “Undecided”. If his answer is “Yes,” that is a belief-system. If his answer is “No,” that is also a belief-system. If it is “Undecided,” then it is not a belief-system. If there is no more “evidence” for one side than the other, then whichever side you choose to adopt becomes a belief-system. Only the third option is not a belief-system. And since by his own admission he does not “believe” in God, that means that he has a belief-system.

In the interview he calls himself “agnostic atheist,” which doesn’t make a lot of sense. It is a contradiction in terms. It sounds like he wants to have his cake and eat it. He needs to make up his mind whether he wants to be agnostic or atheist. He can’t be both at the same time. An atheist is somebody who does not “believe” in God, period. An agnostic is someone who hasn’t made up his mind yet. Once you have made up your mind (one way or another), then you have a belief-system. In the interview he makes it clear that he has made up his mind. He does not “believe” in the existence of God. That means that he has a belief-system. If something is wrong with that argument, I like to know what it is.