God is dead, Friedrich Nietzsche predicted it over a century ago. No, God did not die. We just came to the realization he never existed in the first place. We no longer need him to explain what needs to be explained. We now have better natural explanations of the existing phenomena. They explain more without recourse to the ad hoc theories that supernatural explanations offer believers. Theologians came to realize this in the 60's as announced on the cover of Time magazine, April 8, 1966. What killed him? The sciences.
1) The science of Philology first did this when it was learned that texts could be dated based on grammar, vocabulary, and dialect. Lorenzo Valla (c.1406-1457) used it to show the Donation of Constantine decree was a forgery. In this forged decree the Emperor Constantine transferred authority over Rome and the western part of the Roman Empire to the pope. From the science of philology we've learned there are many forgeries in the canonized Bible (2nd Isaiah, Pastoral Epistles, II Peter, and so on) and that that certain other books in the Bible reveal an evolutionary history. That's science, baby, kick against the goads all you want to.
2) The next big hit came from Astronomy. The Copernican astronomical revolution as defended later by Galileo showed us that we do not live in a geocentric universe. Never did. The Biblical viewpoint, supposedly coming from a divine mind, did not understand this basic fact. The earth revolves around the sun. And we exist on a spiral arm in one galaxy of billions in the universe. The Catholic church took a big hit on this one and lost credibility in the eyes of many scientists.
3) An even bigger hit from Biology, specifically but not limited to Darwinian evolution. The Catholic Church learned from the debacle in Galileo's day and learned to embrace evolution as a fact. Evangelical still denounce it, even though it is slowly winning over the best and the brightest among them. But with evolution we no longer need a creator, for there is nothing left to explain by means of the supernatural hypothesis. Completely obliterated is the literal Genesis account of origins, and since that's the case why must anyone think there is any divine mind behind the writings in the Bible at all? They shouldn't. There is no need of that god-hypothesis, as Pierre-Simon La Place (1749–1827) first informed us.
Everything after this was a forgone conclusion. The Bible was nothing more than a human product. There was no need of looking for a divine mind behind the human authors. If God revealed himself to human beings he did so in ways that are indistinguishable from him not revealing himself at all.
Other sciences came into play as well.
4) Archaeology has debunked many stories in the Bible. Archeologists have discovered several ancient Mesopotamian texts that predate the ones in the Bible and tell similar superstitious stories of the origins of the universe. It has also shown us there was no Exodus of the Israelites out of Egypt.
5) Psychology shows us we are largely products of our environment, that we think illogically many times, that we believe what we prefer to be true, that human beings are not evil so much as ill largely because of their social environment. Psychology shows us there can be no wrathful God who will punish us forever because of what we believe.
6) Anthropology has shown us from the fact that there are many different cultures around the globe and with it a great deal of religious diversity, that there are many rational ways to understand our place in this world. Human beings get along just fine living in these so-called difference universes. As a result many people are embracing multiculturalism. This is contrary to any given located cultural expression of Christianity which equates their Christianity with the absolute standard for cultures as a whole. Such a parochial limited notion is absolute hogwash.
7) Neurology shows us there is a extremely close relationship between our beliefs and neuron firings, which can be drug induced, or even surgically removed. There is therefore no need for the supernatural explanation of the soul.
In fact, these and other sciences have repeatedly pummeled religion for centuries. The fact that there are still believers is a testament to the stubbornness of belief and an almost willful ignorance to believe despite what they teach us because of the psychological need to believe. This need to believe is most clearly seen in the mind of the believer when we consider the massive amount of ubiquitous world-wide suffering and the lack of any satisfactory theodicy explaining why a good omnipotent God allows it. The only explanation that can account for continued belief in the presence of this suffering is wish fulfillment.
God is dead. We do not need him. It's time to give up childish things and think as an adult. Become scientifically literate. Become informed. Grow out of religious belief just as you did with the belief in the Tooth Fairy, Santa Claus and the Easter Bunny.