What Religions Relate to Greek Mythology?

Answer 1

The Roman and Hellenic religions are kissing cousins so to speak, they are related, but not strictly the same. While the Romans adopt many Hellenic myths and identified their own Gods with the Hellenic Gods, practices were quite different. And practice is what polytheistic religions are all about. The Hellenic and Roman religions, whether in ancient or modern times, are orthopraxic, meaning they focus on correct practice rather than orthodoxy (correct belief).

You should also avoid making the mistake of thinking mythology and religion are the same. I have discussed that answering this question: Is_Greek_mythology_an_ancient_religion

For more info on modern Hellenismos, read this discussion: Discuss:Is_ancient_Greek_religion_dead

This is also relevant to the Roman religion as much the same goes for Religio Romana as a reconstructionist approach.