I am saying that you can understand and play music without understanding the theory.
Okay, I know what your argument is.
First off, let's see what the word 'understanding' means.
Collins English Dictionary:
understanding (ˌʌndəˈstændɪŋ )
Definitions
noun
- the ability to learn, judge, make decisions, etc; intelligence or sense
- personal opinion or interpretation of a subject ⇒ my understanding of your predicament
- a mutual agreement or compact, esp an informal or private one
- (mainly British) an unofficial engagement to be married
- (philosophy, archaic) the mind, esp the faculty of reason
Now that we know precisely what the word means, we can say with some authority that understanding music and playing music are, while related, vastly different subjects.
My theoretical knowledge isn't too bad, although it's difficult to make any real claim in this respect as it's impossible to know what you don't know. Whatever my level, I could never claim to understand music as that would require levels of theoretical and practical musical knowledge far beyond anything I'm capable of.
As for playing music without theory, to 'not understand' would require the player to have learnt nothing and therefore be unable to make an informed decision. This is what I already explored in my post above and argued was an almost impossible position to have.
So, in short, given the available information the only logical conclusion is that you're wrong and you haven't provided any evidence to prove otherwise, and what little you have posted contradicts your own argument.
Not that it really matters as long as you enjoy playing and learning the way you're doing it but it makes for an interesting discussion.