There are 12 major gods and goddess's (the 12 Olympians). There's Zeus, Hera, Poseidon, Athena, Ares, Artemis and Apollo, Demeter, Aphrodite, Hermes Dionysus and Hephaestus.
Hades and Hestia are not included because their technically not Olympians.
There were 37 gods & goddesses in Ancient Greece
like 15
as much as i know 12
Several. For the Olympian Court, 12. There were tons of minor gods and goddesses, though. And also three other major gods that didn't have thrones on Mount Olympus.
they believed in polytheism (many gods)
Modern Greece is mainly Greek Orthodox. They believe in the Christian God. The ancient Greeks had many gods. See the Related Link.
Their belief in many gods known as polythiesm
Both of these Ancient Civilizations worshipped many gods/goddesses.
The ancient Greeks were Polytheists. This means that they worshipped more than one God.
Mount Olympus.
12 and 12there are at least 350 or more
Mount Olympus.