I am new to the Philosophy Stack Exchange, though I have been a member of the History Stack Exchange for 3 months. I recently posted 2 answers on the Christianity Stack Exchange regarding the questionable relationship between Deism and Christianity.
Admittedly, I know very little about Huxley's Agnosticism-(I believe it is Thomas Huxley who was the Agnostic. Aldous wrote the famous Distopia "Brave New World"). However, I write this post as someone who is familiar with Agnosticism.
For an Agnostic, the topic of God is inherently unknowable and truly mysterious. The Agnostic's position is predicated on the notion that such a Grand Entity cannot be proved nor disproved. The nature of proof is exclusively geared towards the physical, the materialistic and the tangible; even the intangibility of something, such as Gravity or Time, is still within the realm of the physical and the materialistic. How exactly one can try to prove or for that matter disprove God's existence, are questions that have been asked for time immemorial into the present-day; and yet, we always return "back to square one".......... unresolved and unanswered.
If, however, one chooses to believe in God(s), then he or she certainly has the ability to do so; a belief does not always necessitate proof or affirmation. You can believe that you are going to win the million dollar lottery, though you do not know that you are going to win the lottery-(unless you choose to validate the role of Prophecy and Presaging).
The difficulty that Agnosticism has with so-called Prophets and Clairvoyants, are their spectacular forecasts which in most cases have and continue to yield disappointing results. However, for Theists and "People of Faith", Prophecy provides an opening into the future and in turn, recognizes the magical and miraculous power that a small number of individuals have been and are still able to wield.
If one was to compare an Agnostic with a Theist, both would initially agree with the plausible premise that the existence of God cannot be known and is truly a mystery. However, The Agnostic typically stops at the word, "mystery", whereas the Theist typically continues onward and goes a step further by saying, "Yes it is a mystery, though I still believe in God's existence anyway"-(and a few Theists go a step further by undertaking the erroneous tasking of trying to prove God's existence). If an Agnostic were to continue onward, like the Theist, with regard to believing in-(or even claiming to know about) God's existence, then an Agnostic....... ceases to be an Agnostic and may as well call himself or herself, a Theist.
Now an Agnostic could hope that there is a benign or graceful God; it is certainly not wrong-(either intellectually or morally) to express one's hope for a Gracious Grand Being, as well as a Heavenly Hereafter. Again, I return to my lottery analogy; one can hope that he or she wins the million dollar lottery, but to say I believe or that I know I am going to win the lottery, is just plain foolish. And although the lottery is certainly not God, the rather plain spoken and seemingly simplistic comparison may have some profundity which underscores an Epistemological problem that has mystified humankind since our earliest known origins......and I suspect, will continue to mystify us.
Agnosticism may not be the perfect answer........though it does offer a level of intellectual honesty that few seem to welcome.