How do we know that what you're calling God is not a being among other beings of the same kind? — praxis
Not through experience. There are reasonings that take us from the experience of a God (or, to be more precise, the experience of Being -- or, to be even more precise, the experience of Be! -- which is the best translation of the central term in the Parmenidean poem, which is probably the best and earliest philosophical expression of that experience) to the conclusion that there is only one God (or, Being, etc. Use "X" if the word "God" hampers the argument). But these are reasonings, not experiences. And, being reasonings, they hinge upon certain axioms of faith (non-contradiction, validity of deduction, etc.) which are already "once removed" from the immediacy of experience and which are therefore already risking error.
But regardless of the possibility of error when specifying only one Being, that's the answer to your question.
It’s necessary to use language to talk about things regardless if we’ve experienced them ourselves. — praxis
That is either a tautology or a confusion. The tautology results if we focus on the word "talk", which clearly requires language. But if we look at the core of your statement (replacing "talk" with, say, "communicate" -- animals can communicate without language, at least without "formal language as we usually refer to by that name"), then it is not quite correct and depends on a confusion. Communication is from A to B: A communicates something to B. If there is an intermediary (say, A gives a note to C and asks him to take the note to B), the intermediary is not really communicating anything. He is an instrument. And he/it can be an object (e.g. phones) without any awareness of what is being communicated.
There is a similar process at hand when someone simply repeats words that he read in a book without a reenactment of the experience underlying those words. Anyone can look at John 4:8 and say "God is Love". But no one can
communicate that God is Love if he did not experience the relationship of identity between God and Love that is the core of the passage of John's letter. This is not restricted to religion, obviously. "We the people hold these truths to be self-evident", "Property is theft", "the greatest generation", etc., are all examples of symbols that can (and very frequently do) easily become vacuous if the underlying experience is not present in the speaker.
In this more precise sense, it is impossible to communicate something which you have not experienced.
And, to circle back to your statement, our experience is always inarticulate before it is articulate. The struggle of finding the right words to express what you are experience is familiar to anyone (probably on a daily basis). The articulation of our experiences always go through the use of similes, metaphors, analogies, etc., proceeding from the known in an attempt to indicate the (to the listener -- or to ourselves in an internal dialogue) unknown.
God and other supernatural experiences are a special case, by definition, since the word "supernatural" means precisely something beyond the objects of empirical cognition. And so any language describing the supernatural (or even the unnatural -- e.g. ghosts) will, necessarily, be tentative and require an enormous amount of charity and active participation on the part of the listener, or the communication will simply fail.
We can have knowledge of things beyond our experience with language... — praxis
No, not really. Language is not magical. The word "God" does not convey the experience of God, just as the word "dog" does not convey the experience of dogness. (Remember there are many languages). The role of language is not the transmission of
knowledge; knowledge is always subjective and must be recreated by the listener. Language is more like a map or a recipe. It describes a path which, in the speaker, led to an experience of type X. The listener,
if willing, can attempt to follow that path, reenacting the steps, and -- perhaps -- recreating the experience. But he can also refuse. Or misunderstand. Or lack the willpower. Or lack the training to follow the path. Etc. The important thing to observe is that language, by itself, does not convey knowledge -- words are not bottled meaning.
but unless there’s some other realm that we may somehow have access to, everything, including numbers, which you say do not exist as ordinary objects do, is derived from worldly experience. — praxis
I would agree completely if you took out the word "worldly", which seems to be superfluous at best, or erroneous at worst. What is its role in this sentence? What is "worldly" about, for instance, the efforts that 4-6 year old kids to to grasp the nature of the natural numbers?