I don't have to have been lied to in order to have an incorrect belief about how the world works. If every time I eat a bagel an earthquake strikes for the first few times I eat a bagel, I might well believe, based solely on experience, that my eating a bagel causes earthquakes. But further experimentation with bagel-eating would show that this belief is false/incorrect.First off, how would you be able to recognize that your belief was incorrect? If the earth ceased to quake as you ate a bagel, how would you be able to conclude that the two incidents weren't correlated? That something had been incorrect about your original belief?
Isn't this superstition? The two events, outside of LINGUISTIC communication with others, will always be related. Just because it stops doesn't mean you can conclude the events were never related in the first place. Also, exactly who would the belief be incorrect to? This example doesn't work, because you're speaking of yourself, yourself who already knows the bagel-eating is not related to earth-quaking. Therefore you CAN conclude that the two events are unrelated.
So let's bring in the feral child, bring in a bagel, start an earthquake and get cracking. Ms. Feral Child doesn't know anything about earthquakes. Ms. Feral Child can eat a bagel. So everytime she does the earth shakes. RUMBLE. "My god," Ms. Feral Child doesn't think, "There must be some correlation between my bagel eating and earthquakes."
We have a problem. How can Ms. Feral Child seperate the bagel and the earthquake? Well, I suppose she could've experienced earthquakes before independent of bagel eating, but this would invalidate the whole experiment out of the gate. Right? For our (your) own purposes you'd like the test subject to form an unadulterated belief that bagel-eating is linked to earth-quaking.
So now, moving backward: How can Ms. Feral Child seperate the bagel and the earthquake? I would argue that since the two events occur simultaneously and have occured without predating one another that they are in fact the same event. Bagel eating would involve the taste, the masticating, the digestion, the salivating as much as it involved the earth-quaking.
Now we, being Mr's and Mrs's Non-Feral Children know that there's no correlation between bagel eating and earth-quaking. We also know that the two events are seperate. We have two categories, bagel and earthquake. Of course, these are just morphemes attach to concepts we could've formed anyway without language. You see here's another issue with all of this: To suppose the child has "non-liguistic thought" is I suppose alright, but don't we mean "non-linguistic" in the sense of "not linguistic in the sense of our modern evolved human world". We are really imagining humans at the origin here, something we can only do looking back through the lens of our existing and categorized "linguistic thought". So this "non-linguistic thought" on the part Ms. Feral Child, how can we say it's not "linguistic thought" in a different sense than WE mean "linguistic thought".
Some would have us believe that this feral child, the human being at its origin had completely non-linguistic thought, thought completely uncorrelated to modern thought. This strikes me as ludicrous. If there thought was completely unrelated to our "LINGUISTIC" thought then how did human beings ever form this whole "LANGUAGE" thing in the first place. And, aside from that: What makes this language thing, as a pinning down of concepts succeeding and sometimes failing any different than just an evolution of this arbitrarily defined "non-linguistic thought".
Honestly, I'm losing steam here, so I'll have to come back to this, but one other thing before I sign off. In response to "A1", language is not infinite and neither is thought. This notion of concept that is undefinable seems to imply a complete non-linguistic understanding of a concept. Even if this were possible, which I don't think it is, it's not provable.
These examples are just getting more far flung and ridiculous. We need to move on. Or restructure the discussion.