What If Monotheism Never Made It to History?

The word Monotheism means the belief in a singular God, in contrast to Polytheism which is the belief in several deities. In today’s time most of the religions that the people of the world only believe in one soul being. That being is the most power of any and everything that has be created. The main religions that you have in the world today are Judaism, Christianity, and Islam. These are the main monotheist religions that exist today. Most people do not relize that these religions are very similar to each other. There are not that many differences with in the three. Out of the 7 billion people in the world 1,943,169,634 people only believe in a single God. So how did Monotheism come in to play like it did and take such a huge effect on world in such a fast pace and being effective as it was? Some writers such as Karen Armstrong believe that the concept of monotheism sees a gradual development out of notions of henotheism worshiping a single god while accepting the existence or possible existence of other deities, but the recognition of the existence of many gods, but with the consistent worship of only one deity. However, the historical incidences of monotheism are so rare, that it's difficult to support any theory of the natural progression of religions from polytheism to henotheism to monotheism. Two examples of monolatrism developing from polytheism are the Aten cult in the reign of the Egyptian pharaoh Akhenaten, as well as the rise of Marduk from the tutelary of Babylon to the claim of universal supremacy. (Traditions and Encounters; Ziegler, Herbert pg. 40)
In Iran, Zoroastrianism, Ahura Mazda appears as a supreme and transcendental deity. Depending on the date of Zoroaster (usually placed in the early Iron Age), this may be one of the earliest documented instances of the emergence of monism in an Indo-European religion.
In the ancient Near East, each city had a local patron deity, such as Shamash at Larsa or Sin at Ur. The first claims of global