Belief is the state where people hold a premise or statement to be true.
What does that mean? Knowledge and Belief have to be understood for that. If the Earth is round but people believe it is flat, then the Belief is there, but it is no Knowledge. Knowledge would be that the Earth is round, not perfectly, but the general shape.
At least that is if you follow the conventional scientific explanation. From our point of view the universe has to obey certain laws and each time we find something that does not fit into that we believe we haven’t found the right explanation yet. Knowledge is what is our Belief.
However, can we be sure that our way to explain everything is true and not wrong? Perhaps we just live in a corner of the universe where the rules are as we believe them to be, but in general it’s just Chaos, no Order at all?