Neither of them exist. There is 1 true god.
no they had special powers
Major Gods and Goddesses of GreeceThe major gods and goddesses of Greece were:ZeusPoseidonHeraAphroditeApolloAresArtemisAthenaDionysusHephaestusHermesDemeterHades
Roman gods and goddesses are pretty much the same, they just have different names.
The same place as everyone else. They invented them
Read Sherrilyn Kenyon's Acheron, it has a lot of Greek Gods and Goddesses, same with the rest of the Dark-Hunter series, and some of the Dream-Hunter.
It's impossible for a mortal to become a God
Yes, there were literally hundreds of gods that the Romans had adopted into their culture from their conquests of other empires.
For the same reason as Jesus and Mary to Christians
Greek gods, and goddesses drank wine.
Any human was afraid of the Gods or Goddesses
All along. Gods and goddesses were born as gods and goddesses and remained gods and goddesses throughput their immortality.
There are twelve main gods and goddesses(the Olympians), but there are lots of other minor gods and goddesses in Greek mythology.