I've recently read up on neo-pagan movements and neo-druidism, and was wondering if there's a group that still holds the ideas of the classical Greek or Roman religions? Just wondering...
Few if any neo-pagans practice the way the ancient Greeks and Romans did. They honor the same deities but in different ways. The consciousness of modern humans has advanced quite a bit since Classical times. We don't think in terms of appeasing the gods w/ a sacrifice for a good crop yield or to have an abundant year in trading.
Most of it is because the culture that created the Classical traditions doesn't exist any more. Society is totally different than it was even 100 years ago. We no longer have temples or oracles or public works dedicated to the gods so the practice of honoring them has become more private.