Which symptom of schizophrenia is illustrated in this example: brendon believes he is moses?

These are known as delusions, which is when an individual has an extremely irrational belief, usually associated with themselves, especially seeing themselves as higher in worth than others. 
I personally have had experiences with delusions when I endured a psychotic break last year... It is honestly not pretty. I believed I was a prophet who was sent down by God to preach to the world about a new religion...
Hope this helps!