Like Fallen_Icarus said though, I do think it's possible that extraterrestials could have created us. In fact, it's possible that The Bible is a story based on such a thing. However, it wouldn't necessarily be an "omnipotent, all-powerful, all-knowing god." I think The Bible is just a series of stories based on what happened back then... basically like our written history, except expressed in the form of many anecdotes.

I found a video on google awhile ago, talking about the lost civilization of Atlantis. Basically, they were looking at the bible in a much different way. Totally metaphorical, and looked at the context very carefully. They came up with the possibility that the Bible is recorded history of the ancient civilization of Atlantis, who were extraterrestials. How "Eve" was actually talking about the Eve race, a race of women, who ran away from Earth. And the "Adamic" race (Adam), who were men. Then there was a big war, or something, and the extraterrestials lost most of their technology. That's the gist of it, it's much deeper than that. Although it may not be real, it is interesting. But I do think that the bible is simply a book based on the history of those times. And, it has been changed many times. Also, "God" is a reference to extraterrestials in the video. And it would make sense that people back then would think that extraterrestials would be "God."