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“”We cannot know with certainty if God or Christ exists. They COULD. Then again, there COULD be a giant reptilian bird in charge of everything. Can we be CERTAIN there isn't? No, so it's pointless to talk about.
|—Mr. Weatherhead, South Park|
“”I do not consider it an insult, but rather a compliment to be called an agnostic. I do not pretend to know where many ignorant men are sure — that is all that agnosticism means.
|—Clarence Darrow during the Scopes trial|
Agnosticism is the position that the existence and nature of a god or gods are unknown or unknowable. Agnostics are often looked upon as wishy-washy fence sitters by both atheists and theists; however, most agnostics feel that it's intellectually indefensible to make a strong assertion one way or another. There is a frequent conflation between the idea of atheism ("there is no God") and agnosticism ("we don't know if there's a God") because the former might accurately express what one believes and how they live, while the latter would express their intellectual opinion if pressed.
The term was coined by English biologist T.H. Huxley in 1869, although the concept was expressed far earlier than that, going back to the Greeks around 450 BCE and even earlier mentions in the Hindu Vedas, written between 1700 and 1100 BCE. In modern times, the word agnosticism is used exclusively.
In theory, agnosticism is compatible with all but the most dogmatic of religious faiths, but in practice most agnostics are perceived as godless. Agnostics believe that while there is insufficient evidence to prove that there is a god, believing that there is not a god also requires a leap of faith (similar to any religious conviction) that lacks sufficient evidence. Simply put, agnosticism merely asserts that we lack the knowledge to determine whether or not God exists - in a sense, it differs from more explicit atheism by being a position based on a lack of knowledge, rather than a lack of belief. True agnostics would actually not fit on a hypothetical scale between theism and atheism as they would say the argument is unanswerable and could result in anything, almost like Schrödinger's cat but where the box can never be opened.
Most agnostics, however, can additionally be categorised depending on how their beliefs work out in practice, whether they're more atheistic or theistic. Agnostics may live and act as if there is no God and that no religion is correct, but shy away from the title "atheist" because of the expression of certainty implied. On the other hand, someone may consider themselves spiritual but not religious, or perhaps even nominally follow a religion, but identify as an agnostic in order to convey an honest doubt about the reality of it all.
 Agnostic atheism
Agnostic atheism holds that insufficient evidence exists to prove a god but also that logic is insufficient in overcoming the unknowability of the existence of a god. Agnostic atheists lean towards atheism as a sound null hypothesis, particularly in practice, but acknowledge that they could be wrong. The difference between atheism and agnostic atheism is subtle and may not be always be discernible, though agnostic atheists are generally more tolerant of the religious than more convinced atheists.
The distinction between agnostic atheism and atheism is further blurred if athiests are pressed for specifics about their beliefs. Okay, fine... lack of beliefs. It's clear that most, if not all, atheists are in fact agnostic atheists — as rational-thinking people would certainly stop being atheists if they encounter evidence of God's existence that was sufficient for them. There is a prevalence of fundamentalist theists, but it is far rarer, if not impossible, to find fundamentalist atheists who would stick to their beliefs in the face of sufficient evidence. Thus, if accepting the belief "there probably is no God; I'll act as if there's no God, but will change my mind if necessary" it's really just a matter of personal preference whether to identify as an "agnostic atheist" or just plain simple "atheist."
 Agnostic theism
There is also agnostic theism, which maintains a belief in god, but acknowledges uncertainty regarding the characteristics of that god. Some theist agnostics are also Deist, believing that God created the universe but is irrelevant to the workings of it (essentially, they assert that we may or may not know whether God exists but it matters not anyway because of God's role to play, or lack thereof, in universal affairs). Believing agnostics often identify themselves as fideists, a term coined by Martin Gardner (a theist himself) for people who choose to believe in God because it comforts them and not for intellectual reasons.
 Weak and strong agnosticism
Like pretty much every other philosophical definition ever invented, agnosticism has also been split into so-called "weak" and "strong" positions.
 Strong agnosticism
Going by several titles, including "strong", "hard", "closed" and "permanent", strong agnosticism states that there is no way to answer the question "does God exist?" and further that that, there never will be. It's kind of ironic that something developed to avoid a faith position would state such a thing as a clarifying remark, as should it turn out to be wrong there would have to be some serious goalpost moving to be done! This is similar the belief held by most people who think science should keep its filthy nose out of religious matters.
 Weak agnosticism
That strong agnosticism also goes by the name "permanent" this should be a clue as to what the weak form is; that is, in principle, the question of God's existence is solvable and evidence can be sought. While this isn't synonymous with God's existence definitely being knowable, it has an open mind as to whether we could figure it out. This is almost like being agnostic about being agnostic.
 Somewhat snarky views of agnosticism
 An atheist's opinion
An agnostic is someone too intelligent to believe in gods but too cowardly to be an atheist. A secondary opinion is that since an agnostic lacks positive and explicit belief in any gods anyway, they are, well, technically an atheist anyway. A more charitable view suggested by Leon Baradat is that "Agnostics are the only people smart enough not to take sides in religious matters."
 A theist's opinion
An agnostic is someone too intelligent to be a closed minded, outright atheist but too cowardly to believe and commit to belief in gods. A secondary opinion is that since an agnostic is prepared to believe in gods in principle, are open to the idea of religion and don't reject the concept of a higher power outright, they are, well, technically a theist anyway.
 An agnostic's opinion
A theist is someone who stubbornly insists that their imaginary friend(s) are real.
An atheist is someone who just as stubbornly insists that the theist's friend(s)
would be measurable have measurements if they exist.
A secondary opinion is that theists and atheists should turn their stereos down because some of us are trying to sleep.