“It is the furious longing to give finality to the Universe, to make it conscious and personal, that has brought us to believe in God, to wish that God may exist, to create God, in a word.”

The Tragic Sense of Life (1913), IX : Faith, Hope, and Charity

The Tragic Sense of Life (1913), VII : Love, Suffering, Pity

1900s, God Does Not Exist (1904)

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 132
Variant transcription from "Death of a Genius" in Life Magazine: "I cannot accept any concept of God based on the fear of life or the fear of death, or blind faith. I cannot prove to you that there is no personal God, but if I were to speak of him I would be a liar."
Context: About God, I cannot accept any concept based on the authority of the Church. As long as I can remember, I have resented mass indoctrination. I do not believe in the fear of life, in the fear of death, in blind faith. I cannot prove to you that there is no personal God, but if I were to speak of him, I would be a liar. I do not believe in the God of theology who rewards good and punishes evil. My God created laws that take care of that. His universe is not ruled by wishful thinking, but by immutable laws.

The Tragic Sense of Life (1913), VIII : From God to God
Context: But if ether is nothing but an hypothesis explanatory of light, air on the other hand, is a thing that is directly felt; and even if it did not enable us to explain the phenomenon of sound, we should nevertheless always be directly aware of it, and above all, of the lack of it in moments of suffocation or air-hunger. And in the same way God Himself, not the idea of God, may become a reality that is immediately felt; and even though the idea of God does not enable us to explain either the existence or essence of the Universe, we have at times the direct feeling of God, above all in moments of spiritual suffocation. And the feeling, mark it well, for all that is tragic in it and the whole tragic sense of life is founded upon this — this feeling is a feeling of hunger for God, of the lack of God. To believe in God is, in the first instance... to wish that there may be a God, to be unable to live without Him.

Sam Harris in debate on ABC Nightline (23 March 2010) "Does God Have a Future?" http://www.youtube.com/watch?v=V_kAk2Naz-A&t=1m25s
2010s
Context: The God that our neighbors believe in is essentially an invisible person. He’s a creator deity, who created the universe to have a relationship with one species of primates – lucky us. And he’s got galaxy upon galaxy to attend to, but he’s especially concerned with what we do, and he’s especially concerned with what we do while naked. He almost certainly disapproves of homosexuality. And he’s created this cosmos as a vast laboratory in which to test our powers of credulity, and the test is this: can you believe in this God on bad evidence, which is to say, on faith? And if you can, you will win an eternity of happiness after you die. And it's precisely this sort of god and this sort of scheme that you must believe in if you're going to have any kind of future in politics in this country, no matter what your gifts. You could be an unprecedented genius, you could look like George Clooney, you could have a billion dollars and you could have the social skills of Oprah and you are going nowhere in politics in this country, unless you believe in that sort of god.

Source: Going Home: Jesus and Buddha as Brothers

De Abaitua interview (1998)

The Tragic Sense of Life (1913), VIII : From God to God