Quran 41:53. If you are a Believer in a CREATOR, What’s your ENORMOUS BRAIN created for?

“We will show them Our signs in the universe and within themselves until it becomes clear to them that this ˹Quran˺ is the truth. Is it not enough that your Lord is a Witness over all things?”(Sura Fusilat 41:53) If you are a Believer in a CREATOR, What’s your ENORMOUS BRAIN created for?

53:23 THOUGHTS and IDEAS about Allah which HE did not AUTHORISE (approve) is from men’s own DESIRE.

They are not but [mere] names you have named them – you and your forefathers – for which Allah has sent down no authority. They follow not except assumption and what [their] souls desire, and there has already come to them from their Lord guidance.