They burnt offerings and prayed and sacrificed animals.
At their temples.
Gods
Most did, yes.
At temples or by prayer.
Yes,some do!
To worship their various gods.
It is in their tradition and it is something they strongly believe in.
burnt offerings and temples of worship
They worshiped a whole pantheon of Gods.
Temples dedicated to specific gods or goddesses.
Ancient Greeks needed a place to worship the gods and to do other things.
None. Their gods were anthromorphic.