Originally Posted by
Yarathir
Because a mystical, magical deity in the sky has never been proven to exist. What, however, has been proven is that organisms evolve and take over different shapes. It is also widely believed that most planets that would be considered habitable would have the same evolutionary pressures to a point. This means that it's likely there are other organisms, and possibly life-forms that grew sentient, and eventually highly intelligent like us, humans. Now, that isn't proven. We could technically be the only organisms of this type around in the whole universe. That sounds a bit depressing, in my opinion, but it is certainly possible. I, for one - believe we are not. Between the billions - trillions of star systems, most with technically habitable planets, I very fiercely believe there is at least one other planet with evolved creatures.
Now, if their theoretical development started a lot earlier than on Earth, they - probably, have surpassed us. That's pretty much why.
I don't subscribe to the 'Ancient Aliens'/'Ancient Astronaut' concept, but I do think it is very possible. It's more of a case of 'I don't actively think so, but if it ends up being true, I won't scratch my head at it.".