You can affect it, you can interact with it it, but this does not mean you know how it works. You only know certain parts of functionality, but those can not explain consciousness, abilities to recognise and solve abstract problems, etc.
Detecting which regions of brain are involved in such processes, or even how they work in quite some detail, does not explain how our mind works as a whole.
You seem to think we could soon build our own brain, like others assume they could soon build their AGI.
So you are not different than the other folks in this thread, as you seem to be unable to understand the difference between Frankenstein and either God or Evolution, choose what you prefer. We have just more fun at being dumb than you have, that's all.