"So you truly do not believe in God?"
"I find no reason to, in nature... If the idea of God is unknown in the state of nature, it must then be a human invention."

Those who wish to seek out the cause of miracles and to understand the things of nature as philosophers, and not to stare at them in astonishment like fools, are soon considered heretical and impious, and proclaimed as such by those whom the mob adores as the interpreters of nature and the gods. For these men know that, once ignorance is put aside, that wonderment would be taken away, which is the only means by which their authority is preserved.

Some people would deny the existence of such a powerful God rather than believe that everything else is uncertain. Let us grant them – for purposes of argument – that there is no God, and theology is fiction. On their view, then, I am a product of fate or chance or a long chain of causes and effects. But the less powerful they make my original cause, the more likely it is that I am so imperfect as to be deceived all the time – because deception and error seem to be imperfections.

I can see how it might be possible for a man to look down upon the earth and be an atheist, but I cannot conceive how a man could look up into the heavens and say there is no God.

When people argue for the existence of a supernatural God who is somewhere else and reaches in on occasion to do a miracle or two, they're skipping over the very world that surrounds us and courses through our veins and lights up the sky right here, right now.

I cannot prove that gods do not exist. Nor can I prove that the world and everything in it was not created by an entity or entities in the distant past. But I can tell you that in the millennia we elves have studied nature, we have never witnessed an instance where the rules that govern the world have been broken. That is, we have never seen a miracle. Many events have defied our ability to explain, but we are convinced that we failed because we are still woefully ignorant about the universe and not because a deity altered the workings of nature.

People may love a God of their own imaginations, when they are far from loving such a God as reigns in heaven.

It is now generally admitted, at any rate by philosophers, that the existence of a being having the attributes which define the god of any non-animistic religion cannot be demonstratively proved... [A]ll utterances about the nature of God are nonsensical.

People in this world look at things mistakenly, and think that what they do not understand must be the void. This is not the true void. It is bewilderment.

They learned to have a very high opinion of God and a very low opinion of His works — although they could tell you that this world had been made by God Himself. What they didn’t see was that it is beautiful, and that some of the greatest beauties are the briefest.

In the view of such harmony in the cosmos which I, with my limited human mind, am able to recognize, there are yet people who says there is no God. But what makes me really angry is that they quote me for support of such views. (The Expanded Quotable Einstein, Princeton University, page 214)

Perhaps the outside world really was something akin to a quantum state, and did not exist unless he observed it.

If we are honest — and scientists have to be — we must admit that religion is a jumble of false assertions, with no basis in reality. The very idea of God is a product of the human imagination. It is quite understandable why primitive people, who were so much more exposed to the overpowering forces of nature than we are today, should have personified these forces in fear and trembling. But nowadays, when we understand so many natural processes, we have no need for such solutions. I can’t for the life of me see how the postulate of an Almighty God helps us in any way.

I think that when you consider the beauty of the world and you wonder how it came to be what it is, you are naturally overwhelmed with a feeling of awe, a feeling of admiration and you almost feel a desire to worship something. I feel this, I recognise that other scientists such as Carl Sagan feel this, Einstein felt it. We, all of us, share a kind of religious reverence for the beauties of the universe, for the complexity of life. For the sheer magnitude of the cosmos, the sheer magnitude of geological time. And it’s tempting to translate that feeling of awe and worship into a desire to worship some particular thing, a person, an agent. You want to attribute it to a maker, to a creator. What science has now achieved is an emancipation from that impulse to attribute these things to a creator. — God Delusion debate Professor Richard Dawkins vs John Lennox