Since Atheists are beginning to claim that religion is detrimental to mankind it now devolves upon the Atheist to prove that God does not exist.

Nope, they'd only have to prove religion is harmful... Which is fairly self evident. Your views that humans are basically child-gods would have been blasphemy and gotten you executed during the Inquisition.

In fact, you're not even a theist if you think we're just a space colony, because we only regard them as gods when they aren't at all!
Furthermore you're wrong about the Big Bang Theory, there was matter but it was all packed into an infinitely small space according to the theory.

Plus, there's a new theory kicking around that may work better than the Big Bang Theory : http://www.universetoday.com/104863/goodbye-big-bang-hello-hyper-black-hole-a-new-theory-on-universes-creation/