Russell's_teapot
That pink unicorn thing, well, that's another story.
invisible, so how do you know its pink? but putting boring cliche's aside... you are seen the difference in the implication of the unknown information piece rather than the nature of the information piece:
the main difference isn't specifically about god, but rather how you view the question:
agnostics tend to view it as a straight forward yes/no question: he either exists or he doesn't, 50/50, all equal grounds.
atheists \ tea pot agnostics (we can go into the difference later if it's needed but i guarantee you this convo will go way off topic if we do) tend to view beliefs/assumptions on a probability scale and put god on the low end of it, a.k.a. "god is possible but unlikely". so you can say he is as unlikely as the tooth fairy, as unlikely as the flying spaghetti monster, as unlikely as santa claus, zeus, underwear gnomes, etc'.
but how do you apply probability to complete unknown? statics you can't measure? Occam's razor - a Ti deity in his own right

- tries to answer that, and one way you do that is by breaking down the theory and counting the number of blind assumptions you are actually making. for example for the monotheist god to exist, i am not making just one assumption - i am assuming that the nature of existence can support him, i am assuming that matter and energy can be produced from nothing, which means i am assuming there's a reason it never happens around us, i am assuming the capacity to interact and place with every particle regardless of conditions, and i am assuming there are billions of reasons for the creator to do everything that happens - every single little thing - as well as seemingly rearrange the universe to show that there is always a cause other than himself to explain it, etc.
in short: you break it down and you will find an endless series of assumptions, so whether god exists isn't a 1 in 2 coin toss, rather, each and every single assumption required to support it becomes a 1 in 2 coin toss, and you need all of them to come up on top. the more coins you'll throw, the smaller the chances are that they will all land on the same side. in the case above, the chance is significantly slim.
That is a great example of the tendency towards needing specific data points. Each of those concepts (FSM, PIU, etc.) have specific parameters. The more parameters you place on the concept of God, the less likely it is to exist. My approach to agnosticism is not placing specifically defined concepts of god within their probabilities of existing. Every concept of god a human being defines will be a subset of that human being's ability to conceive of an idea. Taking specifically defined concepts of god and then deciding whether or not it could exist seems to me like a ridiculous mental activity, and yet it does dominate these discussions.
if one does that straight forward you end up with a spinozian god:
I.E. if a pizza is not defined by it's toppings, the cheese or the sauce, if a pizza is beyond the need for bread.. what is a pizza? is my chair a pizza? is this laptop? they certainly well could be, but does a pizza really exist? can you really exclude anything from the possibility that it might be a pizza? in which case, you do indeed have a parameter defining a pizza - that if it exists we know it is defined by it's very existence, there are no boundaries on what is or isn't a pizza, so if pizza exists, everything in existence is thus pizza! the universe is pizza! i believe in the universe! i believe in pizza!
alternatively, you can go the gnostic definition, in which case we don't set parameters for god, but we set parameters for everything else that we believe to not be god, and god becomes the great unknown, the sum of all unrealized possibilities, god is essentially all that does not exist, defined by virtue of being incomprehensible....
- i've done that in my teens, but then i looked at myself and realized i am getting lost in the ecstasy of inferring the universe through poetic meanings, and when it comes down to it it's a trick of my own mind - the human mind's need for "cold" to define the lack of heat, or "static" to define the lack of motion. even if god is defined as the incomprehensible, we can comprehend ourselves enough to see that the need to do to see the incomprehensible as an object rather than the simple lack of comprehension, is part the distortion within our own mind, a trick of our own very human and very semantical eye which has nothing to do with the nature of the universe outside of us.
which redefines the question into the nature of subjectivity - do you define us as subjective view points within the objective universe or do you define the universe as perceived points of consistency within a subjective universe. again i realized the divide isn't something that's actually there - rather it's an odd limit of view points regarding semantic constructs which makes including both difficult. the points of consistency do infer an objective universe in which subjective view points exists and vise versa - either way the playing field is the same, two sides of the same coin. either way you are left with the realization that if there is an objective universe, we are able to become aware of our subjective distortions through it, and if there isn't, we have an ability to experience a sense of viewing our own minds as distorting it.