What are the main differences between polytheistic and monotheistic religions?
The earliest people that we know of were all polytheistic: they all worshipped many gods. From 3000 BC to 539 BC, the Sumerians, the Akkadians, the Assyrians and the Babylonians all worshipped pretty much the same set of gods, despite their cultural differences. The most important of these gods was Ea. Ishtar was the most important goddess. Like the Greek Aphrodite and Demeter, or the Roman Venus and Ceres, or the German Freya, Ishtar was a fertility goddess. The Phoenicians and Canaanites, further west along the Mediterranean coast, were also polytheistic, but they had different gods. Their most important god was Baal, and some reports say that the Phoenicians and Canaanites sacrificed their children to him. Their most important goddess was Astarte, another fertility figure. The Hittites arrived later, around 2500 BC, and had different gods because they were Indo-Europeans, but they were polytheistic too. The first signs of monotheism in West Asia come from the Bible, where by around
Polytheistic religions have more than one god while monotheistic have only one. After that the differences are as varied and diverse as the number of religions. I guess the only other major difference would be that the monotheistic god would be omnipotent whereas the polytheistic gods would divide their “powers” and areas that they rule over.
