Lots of things can happen. Without any evidence, we have no reason to believe that any god is part of any "equation."
If there is an intelligent designer, it went to great lengths to make it appear that everything happened without one.
This is simply a matter of perspective. There are many examples of atheist scientists who later changed their beliefs based on their research of the universe or their particular field of science.
Do you have concrete evidence that disproves the existence of magical keyring transporting genies? When you go to find your keys, do you look where you last left them, assuming no magical keyring transporting genies hid them under the refrigerator, or do you check under the refrigerator first?
Like I mentioned before there is much evidence to support mankind's belief in the existence of a God or a higher intelligent life form. Magical key rings, pink cats or any other spur of the moment invention is just talk for the sake of an argument. There is a reason that *every* racial, national or demographic group has expressed a belief in some form of a deity.