Precisely. Also all the other works (philosphy/religion) have elaborate contraptions to describe what it/God/ is. TTC is the only one that starts out with it cannot be told.
Its a pity that you feel it is some made-up nonsense and doesn't reflect the world in some way. Helps us give a different perspective on how or what things are. But that is alright, different things appeal to different people.
It doesn't matter one bit to the things/ideas whether we believe in them or not. It matters to us what we believe in.
No go live it.