Those of your beliefs that are true and justified, represent knowledge (subject to the exceptions detailed in your link.) However, not all of your beliefs are true or justified.
You may believe that they are, but this belief is false. We all of us carry a basket of beliefs, some of which are true and some of which are false. We carry them in the same basket because we personally cannot tell which are true and which are false. Other people, with access to different information, can tell us which are true and which are false. We can listen to them, learn, and shift false beliefs out of the belief basket. But there will always be some beliefs, for everyone of us, for which the information is not readily available and which we cannot truly know are true.
Most people are able to acknowledge this truth. They can see that some of the beliefs they hold have very little justification, and while they hold them to be true, they cannot in conscience condemn those who call them false beliefs. Belief itself brings no information or evidence. It doesn't confirm or refute anything. It is merely an indication of the state of mind of the believer. The only truth that a belief can show is that the believer believes it. Belief by itself is impotent. It doesn't affect the real world outside the mind of the believer at all. It is a consequence, not a cause. It brings an understanding of the real world to the mind of the believer, but that is all it does. And that understanding may be mistaken.