Kawai, have you read Ishmael? There is an idea brought forth in the book about the story of Genesis being a real story that was originally passed on in the traditional way [by word of mouth around a campfire], and it is the re-processed tale of the modern man as told by the then diminishing "primitive" peoples. The day man decided to pursue unnecessary mass agriculture, was the day money and greed and war began to spread its roots. To these "primitive" peoples, for whom life was somewhat similar to the North American Indian, people who sought possession of land to grow mass amounts of food seemed like a terrible sin. Outside of the carefully balanced life these people lived the only things important were now acquiring more land, growing more food with the use of underlings [people with food or land could rule], and selling or trading this food. Populations grew, as did the gap between those who had and those who hadn't. Somewhere down the line this all translated to feudalism, and let's not forget the many great civilizations that perished due to war and famine [famine being caused usually by too much land being used for agriculture].
Religion, at least Christianity, was introduced by Constantine because it played well with the Roman feudal system and was able to control larger groups of people without much effort.
Islam was created as an effort to unite the warring Arab tribes in the face of the looming Roman threat.
Religion and politics, for most of the world, have been and will be tied up for a long time to come.
"In God We Trust" is a great example of the modern strain that continues to haunt the American system. That and the Republican party. Haha...