History has shown us that the belief in gods or a god were mainly structured and developed on the basis of human ignorance or the lack of knowledge of the world we live in.
The adverse fear that developed after an earthquake or a bolt of lighting as an example, men of ancient times did not have the knowledge of what had cause it, so
human imagination took over and the belief in god was born. This happened all over the planet not just in the middle east, the sun being the most popular target as being the god
Maybe the best possible answer for why god is so angry is because he never had the opportunity to exist