How many Greeks believe in mythology?

I don't know about in modern times, but in Ancient times, virtually all Greeks believed in their gods, which we call Greek Mythology. For the Greeks, their religion was much more important in their lives than religion is for many people today. In fact, their religion was a lifestyle for them. As for modern days, I'm hazarding the guess that there are a lot less people who are greek or live in Greece that believe in ancient Greek Mythology. Hope I helped! :)