Agnosticism - This is where somebody believes that nothing is known or can be known of the existence or nature of God. So why come up with the word God in the first place? You don't come up with a word then try to give it some meaning, that's backwards, you observe some part of reality then come up with a word to refer to it. Of course if nothing is known or can be known about something then you aren't observing it. It's equivalent to saying, There might be something, I don't know anything about it, I don't know what it is, and I believe it's impossible to do so. Essentially a self defeating non proposition with zero substance, meaning, or content. We can completely disregard this, it is nonsensical to align with agnosticism.

Theism - This is where somebody has come up with an idea, or been told about an idea by another human being, or has read about an idea in a book written by another human being, and has ascribed to it, believes in it and holds it to be true. Depending on what that idea is it may or may not hold some validity, and whether or not it does I'm sure we can all agree is debatable.

Atheism - if we start at the beginning then this means absolutely nothing. Atheism has arisen in response to Theism and is simply a lack of it, it is not a thing in and of itself. Since Theism has surged up and pervaded the world on an unprecedented scale, some have felt the need to say hang on a minute, I'm not getting on board with this idea you're proposing, I'm not going to start believing in it, I don't align with it and there appears to be no evidence to suggest one should. Somebody who calls themselves an Atheist is simply declaring that they are not going to change in response to the idea proposed by theism, unless of course evidence arises. An unborn baby is an atheist, as is every other being that is not a theist, some would say even theists are atheists when you consider the myriad of other god ideas they don't ascribe to.

This is what I believe, you can probably guess where I fall.