I think God is a genderless, infinite being that isn't like anything we can imagine. It doesn't look human or in any form. I personally like to think that it's more like a spirit that inhabits everything and always existed. If you keep wondering where things come from (ex. what did the Big Bang come from?), you can keep going infinitely but ultimately something at the end got to have come from *nothingness*. To me this very first source must be God or made by God.
I do think however that most Gods humans made up are reasons to explain things they did not understand. Perhaps some religions got certain aspects right, but there's just no way to know.
Those TV shows are really interesting though... It's like those hieroglyphics, that look like helicopters, they always fascinate me.







