That, like every other religion, is very arguable (actually, since mythology is in the name its a bit harder to argue on the "real" point) but i dont think its real since ima devout Christian (and have fun with it, not devout like as in Puritan, but devout as in I really LOVE Jesus and would not give up my relationship with Him even for my life).
Myths are not real. In olden times, the Greeks believed in all of the gods and goddesses to explain natural effects on earth such as earthquakes and natural disasters. The Greeks were polytheistic, but now, most people are monotheistic.
Some say god and the devil are real, some say Zeus posiden and hades are real, but you know people think the devil and god are more believable, but in my opinion they are both pretty non realistic aim not an atheist, but I'm saying floating up to clouds after you die? That's a theory! See my point is here that people have different thoughts, and believe what you want to believe! But man im not saying if you believe you can fly to jump off a skyscraper! I'm saying like the gods and stuff. I think I believe in Greek gods more than I do god himself. Part of my family is also Greek. So believe what you want.