I quite agree. What, exactly, do
you mean by the word "knowledge"?
If you're driving down the road, and the fuel gauge shows "1/2", you can consider it "knowledge".
However, the gauge could be stuck! Then your fuel level really wasn't knowledge, then, was it? It was belief based on evidence (which was wrong!).
Oh, well. So much for both belief based on evidence, and knowledge. They both could be wrong. You might run out of gas.
Not in standard philosophical practice. Knowledge is defined as a justified true belief -- with emphasis, in this case, on true. If you believe (based on evidence) that your gas tank is half-full, and it is, then you've got "knowledge."
If you believe, based on evidence, that your tank is half-full, when the gauge is stuck and you're really running on fumes,.... well, then what you have is belief, but not knowledge. But knowledge, by definition, can't be wrong.
The irony, of course (and one not lost on philosophers) is that although we can
have knowledge, we can never be certain that we have knowledge, because a belief-based-on-evidence might well be wrong. From our perspective, all we can be certain of having is belief... but hat doesn't deny the existence of knowledge.
But the central point that you keep dodging is that knowledge is just a form of belief. It's a belief, based on evidence, that is true. A belief, even if it happens to be true, is not "knowledge" unless you can justify it (i.e. it is based on evidence).