SDN: Effing the Ineffable Since 2002.
I apologize in advance for this tangent, but I do feel the need to stick up for Einstein just a bit--I cannot see his position as a blunder, but rather a very conscientiously thought-out position that was proven to be wrong. His rejection of quantum mechanics was not so much with its predictive power (he acknowledged its practicality), but the claim of its completeness. In other words, he believed that there must be a deeper theory and that quantum mechanics is, to use an analogy I've put forward before, somewhat like statistics--perhaps completely right in its results, but still not the real physics.
And it wasn't really an unreasonable position. For all his talk of "playing dice" or "the Moon is still there", what was really bothering him in QM was entanglement--the loss of both realism and locality. The Einstein-Podolsky-Rosen paper makes the dillema explicit: either physics is non-local or quantum mechanics is incomplete. In this he was completely correct. Considering that his own General Theory of Relativity adopted the position that physics is local as a first principle (it's implicit in the principle of equivalence), his argument establishes that the principles of GTR and the principles of QM are incompatible--something just about every modern physicist agrees with. It's no surprise that Einstein would side with locality rather than with QM being complete; perhaps he was a bit biased towards his own theory, but in the end, it's not at all a careless or unreasoning mistake to pit the by-then accepted and unfalsified theory (GTR) against a relative newcomer (QM). A mistake it was, but the objective evidence to prove Einstein mistaken did not exist until after his death, in the results of J.S. Bell.
Thus, attributing Einstein's position to remnants of religion is an unfair oversimplification at best, since in fact anyone who accepts the principles of GTR would be logically forced to conclude that QM is incomplete, just like Einstein did. He did like to misuse the term "God" if understood in terms of any traditional religion, but his "God", lacking even consciousness, was something even deists would find too personal; a closer comparison would be the naturalistic pantheism. In his own words:
Albert Einstein wrote:I believe in Spinoza's God who reveals himself in the orderly harmony of what exists, not in a God who concerns himself with the fates and actions of human beings.
Ironically, many theists view pantheism (of Spinoza's variety or otherwise) as just a curious kind of atheism. Regardless of whether pantheists would agree with such an evaluation (hmm... Rye?), it's certainly the case that that sort of "God" is completely unlike any monotheistic variety, so invoking Einstein offers a very poor defense for any fundamentalist.
Again, I apologize.