What is the difference between monotheism polytheism and atheism?

Monotheism comes from two Classical Greek Words meaning "a single god" and it refers to a belief in one God.

Polytheism comes from two Greek Words meaning "many gods" and refers to religions (like ancient Egyptian) where many gods are worshipped.

Atheism comes from the Greek for "without a god" and refers to people who do not believe in any spiritual power, god or creator.