The idea of no creator and no one control the rain, victory or breeding is relatively new to human.
this idea is very revolutionary like the idea that earth is not center of the universe.
all our ancestor are religious in some way, they believe that there is some sort of supernatural power control everything , the sun , the death , the disease ,and they believe that some acts of human will make god(s) angry, and they don't want the supernatural power to be angry, so people invent some rules to avoid their anger, they invent praying and animal sacrifice and even human sacrifice.
One of these things that make gods feel angry that if you not love these gods very very much.
But what make Islam unique is that you have to love god and his messenger even more than anything, you can sacrifice ALL to get the ultimate love from god in order for him to be satisfied.
"Say, [O Muhammad], "If your fathers, your sons, your brothers, your wives, your relatives, wealth which you have obtained, commerce wherein you fear decline, and dwellings with which you are pleased are more beloved to you than Allah and His Messenger and jihad in His cause, then wait until Allah executes His command. And Allah does not guide the defiantly disobedient people."
Some get angry from drawing or cartoon, or if any one say something negative about god or messenger
The reason that that get angry or upset because of fear, they are really afraid that the god will be angry with them -because they can not stand for the love, or love him enough.
because god ask them to love them more than everything, and if they don't then there will be punishment that can not be described.
In psychology we know that fear and anger are same thing but with different combination. you get angry if some one put your survive in danger, we use anger as warning from danger. And same for fear.