My beliefs don't change much. Just whether I care.
The more chronic and pervasive the delusions, the more stable your belief system. It's the sensitivity/granularity of your perception "regulation", some flexibility. Flexibility comes with use.
Does that make any sense? My perception (or rather the effects and content, not appraisal) is slower than my mood, but I'm in a mixed state so always a bit delusional or at least I can't distinguish between sane ideas and "insanity" much. I try to dumb it down.

Sorry: that was a mania leftover. Maybe I'm that creator of the universe but I just forgot because I have a very bad memory in times like these.
I tire myself.

I've got dozens of years of nonsense in that head of mine.
God exists though. We are very close (not just me).