[Serious] Atheist Dogma

[Mr.wizard]

Why should anyone care if you consider a babies non-belief trivial? 

I'm saying that they are atheist in a trivial sense. They lack belief in God, but they lack belief in everything else, too.

So a baby doesn't exit the womb contemplating the existence of a god, why is this a problem[?]

It's not a problem. It's a fact of life. 

 and why does this require a change to the definition of atheism?

It doesn't. But some people are claiming that their atheism, as thinking adults, is the same as that of a baby who has never heard of or believed anything in its life. I don't accept this.

Some people claim that the atheism of a thinking adult is lack, only lack, and nothing but lack. I say it is a lack, but one that is sustained by beliefs (=what we hold to be true) about the world and what constitutes good evidence.

Because Atheism only requires that you don't believe, that's all it is. Not believing is not believing, the reasons do not matter in regards to being an atheist. You are trying to make being an atheist into some deep meaningful position, when in fact it's just a really simplistic default position.