There are generally 3 broad pagan-types in contemporary Greece.
1. One group includes those who dont rally want to break off from Christian
Orthodoxy. Instead they try to convince themselves and everyone else that the Orthodox Christianity has basically adopted most of its rituals and liturgy from pre-christianity. They argue, for example, that Easteris, for most Greeks, far more important a religious ceremony than, say, Christmas. As a matter of fact, Easter Mass owes a lot of its "direction" to ancient theater. Moreover they argue that various saints have assumed in folklore the role of ancinet Gods. For example, St Nicholas
is protector of the sea, a la Poseidon.
2. A second group which is gaining in popularity has severed all links with Judeo-Christianity, and is trying to reenact ancient religious ceremonies in places like Mt Olympus. These folks take the Gods of Olympus literally. Tryphon Olympios, a Greek-Swedish university professor, has been quite active in this attempt. As is to be expected, there are already splinter religious groups. Wanna-be religious leaders are bickering about how religious mysteries and ceremonies should be properly executed, etc etc.
3. The third group also rejects monotheistic religions, as monotheism breeds totalitarianism. This view holds that in classical Greece religion was not "organized", there was nothing equivalent to the "Bible" or the "Koran" and Gods were mostly allegorical. Polytheism to them is essentially a matter of keeping an open mind in questions of ethics and philosophy. To this extent Athens was full of statues "to the unknown God". They hold that any attempt to today codify a "Greek pagan ritual" and to claim that it is "orthodox" would actually end up mimicking "non-pagan" religions.