Answer:
Polytheism means multi God worshipping, that is praying to many gods and characterising each of them for a specific objective like God of wind, god of victory etc.
Whereas monotheism is belief in only one God like in Islam. In Islam there is only one God, Allah and a person will not be a Muslim unless he only worship Allah.
The first monotheism is literally Islam itself and the first man on Earth is a follower of it. Of course I am talking abt Adam.
First Polytheistic civilisation is unclear it's expected as the ancient egyptians and the Sumeria civilisations
