If brain has nothing to do with religion, then why does Quran want people to "Tafaqhu fid deen" or use "Afala taqilon?" "Afala tasharoon"?
Do you order righteousness to mankind and forget yourselves whereas you read the Book? Then, have you nosense? (Al-Bakara 44)
Then do they not ponder in Quran and if it had been from other than Allah, then they would surely have foundtherein much discrepancy? (An-Nisaa, 82)
Say you, 'I do not say to you, I possess the treasures, of Allah, 'and nor I Say,' I know the unseen myself, andnor do I say to you, 'I am an angel. I follow only that which is revealed to me.' Say you, shall the blind and theseeing become equal? Do you then not ponder? (Al-An'aam, 50)
Just three of the examples. Probably you should at least read Quran once before advocating your understanding of Islam.