I don't think anyone still believes* in the classical pantheon
There are communities of neo-pagan revivalists in Greece today, tens of thousands of people at least. Sometimes tied to ultra-nationalist Greek political groups.
Hopefully organized religion has gone the way of the dodo by the 23rd/24th century. We're supposed to evolve, right? Not stay stuck in the dark ages.
Hopefully, in the future we won't be seeing suppression of personal choice, whether you believe in God (or gods), or believe God doesn't exist. You will have the freedom to follow your beliefs.