[Hebrews 11:6]

Those believing in the Big Bang hypothesis will have a hard time explaining how chaos created this.

Your general point is well-taken, that the brain bears obvious evidence of careful design. Your example is inapt: there was nothing chaotic about the Cosmic Creation Event. Indeed, scientists studying it determined it was so exquisitely crafted and fine-tuned, to better than one part in 10¹²⁰, that it is the strongest known evidence for the existence of an intelligent Creator.

[politicket]

that it is the strongest known evidence for the existence of an intelligent Creator

Agree about the intelligent Creator.

Disagree about the hypothesis of a big bang.