Existence of God cannot be a Myth. Lack of proof is itself a Proof.

God exists to answer all the possible questions that science does not have any explanations for. And the science will never have an explanation for everything. We should always strive to find an explanation though so we can fully harness the energy and matter around us and to not get fooled into believing in an illusion. However, its true that the science will be helpless at some point from generation to generation, no matter how advanced it gets.

This is simply because of the fact that the humans will never be able to reach every part of the universe and there will always be a "final frontier," as Star Trek puts it, for the humankind to explore and to explain by scientific reasoning. For instance, we might never ever be able to get the first-hand knowledge of the physical laws that govern the interplay of energy and matter on the most distant brightest star, Deneb, in our galaxy, because even if we travel at the light's speed, we would exhaust our body's limited lifespan and die as it'll take us over 7000 years to reach it.

Even if we do discover and theorize all the scientific laws in play in this universe, we can still never be at a stage of tweaking the laws to our taste. Every scientific advancement so far has involved harnessing/transforming matter or energy to our needs, but how can we generate this matter or energy out of nothing, having customized qualities and attributes of our liking? Somehow, the 116 elements in the periodic table came about to their existence, but how can science explain their origination. We will have to call their origination a reaction to some action, [knock knock] "Newton's 3rd Law"? There has to be the source of this action, some source that preceded the "reaction" that was caused i.e. the origination of the periodic table elements and all the matter that resulted from them!

Besides these more technical questions regarding the universe around us, even the most elementary of questions pertinent to the existence of all "living" beings in this universe are equally bewildering. Questions like the inception of a soul in the embryo within a female's womb, and the itinerary of that soul beyond this material world after the body's heart stops pumping, are completely unanswerable and silly to even hypothesize by science. Genetics can explain the physical traits of a baby but cannot comment on the moral traits inherited by the soul.

Not having an answer to any of the above questions is an irrefutable evidence in itself of the existence of an external power. "Our limited minds cannot grasp the mysterious force that sways the constellations," as Einstein puts it in an interview published in 1930's Viereck's book, Glimpses of the Great. At every instance of the humankind's existence, we will be forced to believe that the existence of that mysterious force, God, is to our delight or distress, alas, inevitable.