What is the point of terrorism ? I don't understand the allah thing and all the idea.?

The idea is to scare the people so badly that they will give up without a fight, no matter who the terrorists are.
Allah is the Arabic word for God, and Muslims usually say Allah even if they are not Arabic-speakers. Would God approve of terrorism? Well, some people apparently think so. They must think Allah is too weak to manage things without recruiting a bunch of murderers.

There is no point other than to instill terror in us. That is all they want to do, is to make us afraid. All the Allah stuff they spout is pure jibberish and does not really mean much.