'is there equivalency between the extraordinary claims of Christianty and Greek gods?'
IMHO, yes, absolutely - and the proposition can rightly be extended to all 'gods'. In different times and places people have believed/believe in their own gods just as enthusiatically as 'Christians' of whatever flavour do today. Lack of evidence doesn't seem to have ever been a bar to belief.
There are interesting discussions on the apparent predisposition of humans to 'need' a religion to believe in.
Scientific knowledge is increasingly rapidly, and its availability is increasing exponentially (for example, archaeology was in its infancy when C T Russell was doing his 'pyramidology' studies). In some cultures there is a growth in the number of people disposed to ask for proof, or at least a credible explanation.
And yet - there are a surprisingly large number of people in 'sophisticated' countries who believe that the world (and mankind) is 6,000 years old - JWs still teach it - and believe in one of the many creation myths despite all evidence to the contrary. That worries me a little, to be honest.
To the Greeks their gods were very real. One can sense this not only by visiting their temples and 'sacred sites' but vestiges remain today. In Paphos, Cyprus (the birthplace of Aphrodite (Venus), the 'goddess of love') they still hold the annual 'Katyklysmos' sea-based festival to commemorate her birth from the waves. The festival was later taken over by the Christian church (as were so many pagan festivals) as a celebration of the 'great flood' but they didn't really fool anybody.
As far as labels are concerned, I think most people understand 'agnostics' as 'doubters who haven't made their minds up' and atheists as 'those who say there is no god'. I'm an atheist.
PS: I'm no expert on 'Greek gods' but IIRC Hercules wasn't regarded as one, was he? I thought he was just one of the 'heroes'.