Genesis says the Sun was created on the 1sh day. do you believe it?
Genesis says land animals were created after Adam. do you believe it?
No Santa Claus, no Tooth Fairy -- those are both beliefs.
Do you "believe" in that keyboard in front of you? What the heck difference would it make if you did or did not.
The keyboard would still be there. You of course, could ignore it.
Or do you "believe" in good whiskey? The bottle at right hand is still there, "belief" or not.
Now ... if you "believe" the whiskey is a fine lively taste to the palate and warms the gut you will, I'd say and most physiologists too, I'd guesss -- you will actually taste your "belief". Perhaps it is that such "belief" pre-conditions the palate, the gut, the body chemical. Maybe. But this is to say that "belief" can be a great thing in the right context -- to improve the taste of things, to improve the comfort, the enjoyement.
Or reveresed -- a negative "belief" will also color taste and take on things.