And this is my opinion, yes.

I can agree with Creationists on one thing. There is a higher power responsible for our beginning. However, where we start to disagree is when you begin to describe this 'higher power'.

I think extra-terrestrial beings, meaning, not originating from this planet, colonized Earth, for whatever reason.

To answer your question, I think they are still among us, and are 'guiding us'. I think most of our technological breakthroughs, (Atom Bomb, E-MC squared, Engine, the Wheel) were all handed down to us by these beings. I think this world would be VERY different if they weren't guiding us.