Is mano or mind function of brain? Then what we perceive is mere creation of brain

If brain cease to function all phenomenon also cease to function as well. Body including brain is so vulnerable to break up and Buddha emphasized that no one should cling to this body and its function to avoid all sufferings. Evolution is truth and all religions are mere fantasy which originated from ignorance to the scientific findings. Everything which is brought about should perish in no time. That's the essence of Buddha's teaching(Dhamma).