The professor’s quiz answers were both true and deliberately provocative. He was picking a fight.
Actually the first answer is only true if the context was Muslim terrorists only. Some terrorists are Maoist, anarchist, narco-cartel, nationalist...
Teach the truth. Just do it a bit more gracefully: where do Islamist terrorists find justification for their acts in the hadiths and Koran?
Yes, I don’t think the IRA terrorists or the Basque terrorists were inspired by anything in the Koran.