The idea of God was rooted in common sense. as we observe our world through our senses we see the natural law of cause & effect, everything in world it seems has some cause. eg. rivers are caused by rain, rain is caused by clouds, clouds are caused by water vapor that came from the sea, vapor was caused by the sun.,ect... Could the ultimate cause of everything be God? Our ancestors thought so. Thus the beginning of the concept of God. Such was the idea that guided our civilization throughout history.
However, as we enter our technological age, we have discerned that our feeble senses are enadequate to study our world more precisely. Common sense was no longer enough. We began inventing machines & equiptments that are many times more powerful than our human senses allow, and to peer on other areas as well that we can't normally detect. Telescopes, microscopes, satellites,atomic accelerators etc..... These increased our understanding of the natural laws. One of the most dramatic discoveries that i can think of is the enhanced understanding of cause & effect or causality. We have discovered that in the subatomic level, quantum particles no longer obey the familiar law of causality. A particle can exist out of nothing. Heck even the laws of thermodynamics no longer apply! Moreover, (Albert Einstien and others) General theory of Relativity shows that time has a beginning and that the universe started as an infinitessmally small & dense point that burst into a big bang.
These modern ideas has shown that the causality idea is not always true at all scales. This in turn overturns the need of a Creator to cause it all. JW's beloved word "He causes to become" becomes threatened and shaken. Here's the reason why:
1. If the universe started so small, smaller than quantum particles we see now, then the rule of causality no longer applies to it. At the quantum scale quantum mechanics takes place requiring no causality. Thus the universe can exist out of nothing.
2. Time, if run backwards ends at the big bang. If there was no time before the big bang, then there is no time for a God to create the universe. (Stephen Hawkins argument). I might add as well that there is also no time for Gods' existence.
So here we have it. now it looks probable that God did not exist considering how humans come up with such idea and how modern science shows that our universe could have existed without cause. Ofcouse, any evidence, suggestive or not, for the Gods' existence will be equally interesting.