Did he get his orders from the Koran?
Exactly. He is one of the guys who purged the words Jihadist and Islamic Terrorism from CIA documents and training. He also illegally leaked confidential information which he felt that the terrorists had a right to know.
He used the CIA to spy on the Senate and on other members of the CIA who disagreed with his policies, and then lied to the Senate about it and several other issues.
It is rumored that he converted to Islam and is a Muslim, however this has not been confirmed. But whether or not he is a Muslim convert (we don't know?), he is most certainly a fervent Muslim sympathizer.
Brennan is one of the most corrupt and dishonest people to ever work in the CIA. For him to come out so fanatically against President Trump is a badge of honor to Trump. The last thing Trump should ever want is for people like Brennan to like him and to approve of his policies.