Ombow, That is a good question. Those people are the victims of brainwashing. They use their own brand of propaganda. Look how effective it is. 72 virgins when you die as a reward? Really? THAT works? "How stupid are those people?" you ask, right?
Well, from their perspective, you are stupid for believing in the Christian Jesus. But, you KNOW you're right, and they're stupid.
Am I helping you to connect the dots yet? I'm just saying that humans have a remarkable ability to be absolutely convinced that they are smart and correct. Most of the time, they are just subscribing to the propaganda of the land. MF4