Just guessing here but I imagine that our understanding of God is severely skewed by the teachings of the many religions trying to maintain their power bases.
;-)
For example, if God created this Earth then by definition God must be an extraterrestrial by definition since He did/could NOT create Himself.  I also suspect that extraterrestrials aren't the cutesy, bug-eyed greys in most people's imagination. 
PS - I do believe in a God and have great respect for what I think is His plan and purpose.  It's sorting the details that's fun.
Sorry for the gender bias and leading capital letters.  It's habit.