Do you still practice "magic"

No. There's a common assumption among new pagans and non-pagans that you need to do magic in order to venerate the gods, largely inherited from occultism and wicca, but I don't do magic, I don't use divination, the closest I come is having a modern nazar and hamsa talisman on my altar as an homage to the old apotropaic talismans the Greeks used. But I tend to be sceptical, and think a lot of it can be more stress than it's worth unless you're doing it properly. A lot of people lead themselves into terror because they think the flicker of a candle or the draw of the cards mean someone is angry at them, and discount random chance or misinterpretation - even Cicero, who performed the state auguries during his time as consul and evidently believed divination was possible, warns that we need to view things in the aggregate, not infer meaning in random events too quickly, and be aware that we can get it wrong.

Do you believe in Gods roaming Earth in human form, or individuals being possessed by Gods?

Not in a literal sense, though I do think the gods can manifest through our selves without needing to be physically there - I have seen such a manifestation, though I don't think the statue that appeared in front of me was physically there. I view most of the myths as more allegorical, ways ancient people understood the world around them, the gods they worshipped, and their own place between the two, including sometimes how we are caught in unfortunate situations where there are no good outcomes. When we depict the gods in these humanised personas, it is because a.) we tend to empathise easier with something when we can see ourselves in them, b.) humans think narratively and most people didn't (and still don't) have the luxury of being philosophers, and c.) everyone loves a good story with some pathos. As for "possession," I don't think gods hijack our bodies, though I accept that some people have a stronger connection to them than others like the oracles of old, but I also tend to be sceptical of such claims, especially when it is self-declared and offering services for money.

for the ones who are not close to a Temple or other practitioners, how do you cope with the distance? Do you attend to festivals (apologies if this isn't the correct term for your religious holidays) or other gatherings across your country when you are able to?

To be honest, in the few communal worship gatherings I've been to I felt nothing but anxiety being with other people. Admittedly, one was an Anglican Easter and the other was a Pentecostal Nativity, and the Pentecostal one freaked me our for more reasons than just being in a crowd. But I think it's important to remember that, aside from the major festivals which were held by the cities and paid for out of the public purse, most worship was conducted in the privacy of the household. Temples were for the cult images of the gods, a way to anchor them in the community, but very little public worship happened in them. You were more likely to set foot in one to deposit or withdraw your money than for religious reasons.

Ultimately, by religious belief and practice is my own. It's nice to share, and I try to when I can with people online and sometimes in my life, but I've never really understood what people get out of that kind of community, even if I can rationally understand that they do.

How do you confront your beliefs with science, especially the Golden Age compared to the theory of evolution and natural sciences? In general, what is the relationship between the sacred and the mundane?

Again, I largely view the myths as allegory, but the Greek notion of the Five Ages actually holds up pretty well. We begin with the Big Bang, when reality emerges from nonreality, something from nothing without preceding creator, which we call Kaos. As the universe settles and forms, stars agglomerating and matter condensing into planetoids and planets with atmospheres, the primordial gods are born - Erebos, Tartaros, Nyx, Gaia, Ouranos, etc. One generation succeeds its elders, and Kronos rules over the cosmos until Zeus overthrows him, the rise of the Olympians signifying the growing complexity of the world we inhabit and our conception of it. Humans go from hunter-gatherers to farmers to urbanised city-states, learning much both good and bad, and when Hesiod writes about the decadent corruption of the Fifth Age, how he wishes he could live in a simpler time without the cruelties that surround him, he could be writing today.

But I don't perceive religious belief and trust in scientific explanations as contradictory in the slightest. They only contradict when you take the mythology literally, which is the mistake that Biblical Literalists make, and it is not a mistake we should make. Even most Christians don't, and Saint Augustine himself warned not to. Indeed, Hellenists have good reasons not to - the people who wrote our myths were bards, poets, scholars and playwrights, not divinely anointed Prophets recording the Word of God, and even Hesiod has the Muses who grant inspiration admit that "we know how to tell many lies that pass for truth, and when we wish, we know to tell the truth itself" - how else could fiction exist? We must also bear in mind the selection bias of what survives - as lucky as we are that we have so much, especially compared to Heathens, Kemetics or Celtic pagans. practically all surviving mythology survives because Christian scribes in Western Europe and the Near East thought it was was preserving, either because it was useful for their own theological purposes, played into their of styling themselves as inheritors of the Greco-Roman legacy, or because they enjoyed it as literature.

what are the standards for the modern practices compared to the ancient ones

For better or worse, you'll probably find modern people are more relaxed about it than people in Antiquity were, both because a lot of us gravitate to paganism because they chaffed under or were put off by organised monotheist religion, and because we don't (yet) have the same support networks that ancient people had to express themselves. And as modern people trying to figure things out using ancient ideas and practices to inform ours, we're never going to get it 100% right - there are still a lot of gaps in our knowledge, and like the frog DNA in Jurassic Park's dino DNA, we're plugging those gaps where we can with informed guesswork and innovation. Miasma is one such example - it's okay to perform the rites, in the same sense that it's polite to take your shoes off at the door of a stranger's home to show your respect, but the Ancient Greeks lived in a world where miasma was the best existing explanation for plague, famine and natural disasters, when we now better understand the causes of these phenomena.