My reason tells me nothing of the sort, Len.
Then your reasoning ability is very different from mine! I can't believe something and not believe it at the same time.
Neither can I.
I can however experience things without knowing what their source is.
Why on earth should you think their source could be anything other than you own brain? That is what I can't take in.
How you can attribute everything to the brain ...I can't understand. The brain is just a piece of flesh and is a part of the human system. It did not create the human system.
DNA is responsible for the creation of the brain and other systems. What is responsible for the existence of DNA and how does it have the capacity of creating such a complex system, we don't know.
The only explanation you could possibly have is 'chance' and evolutionary processes...which again explains 'how' something happens but not 'why'. The first cause is still unknown.
I believe that just as complex computers have evolved from simple systems through the intervention of human intelligence....so also the human biology has evolved through the intervention of some superior intelligence that works from within our minds.
We may not know what this superior intelligence is and we might use anthropomorphic models to understand it......but that does not eliminate the existence of this unknown elemental intelligence.