Your theory reminds me of two things.
First, this pop culture trope which i myself as a ET enthusiast find to be quite enthralling;
http://tvtropes.org/pmwiki/pmwiki.php/Main/Precursors(This article was earlier called "Ancient Engineers", which i think is more fitting lel)
"Precursors - Also known as "ancients." They are a standard fixture of much science fiction and fantasy: an ancient race whose culture and knowledge rose to its pinnacle in ages long past but which is now extinct or Ascended to a Higher Plane of Existence. In science fiction settings, they are usually considered the first race to have gained sentience in the universe or galaxy, giving them a noticeable leg up on everybody else; in fantasy settings, they will usually be the original, pinnacle sentient species created by the gods/God. At their height, they are usually rumored to have been capable of doing (and have done) just about anything, up to and including creating intelligent species and reworking entire worlds with a snap of a finger, and almost any strange and persistent mystery in the story's 'verse is usually laid at their feet. They may have been sufficiently advanced, or just much better than everyone else with technology/magic, but either way they left their mark, a mark that remains to this day."
Then the second thing i was reminded of was ancient greeko-roman mythology, norse one too to some extent. There's a game that came out a while back called "Son of Rome" where the gods are actively meddling with the player/plot and try to trick each other to the very end, which would conform to your theory of god/s using us for "entertainment/experiments" and so on.
That being said, i'm not really a believer-kind of person, but i do believe that almost anything (at least on this level of existence, aka our dimension) can be explained in human terms once it is properly anaylzed and understood.