Einstein’s letter rejecting God set to be auctioned again at Christie’s

A handwritten letter from physicist Albert Einstein in which he explicitly rejected God and religion is set to be auctioned at Christie's auction house in New York City on Tuesday for the second time since he wrote it a year before his death.

Einstein wrote the infamous "God letter" to German philosopher Eric Gutkind in 1954 who had written a book called Choose Life: The Biblical Call to Revolt that, apparently, Einstein did not like.

His letter, written in German, caused a sensation when it first went public at an auction sale in 2008. The letter is now expected to sell for between $1 million and $1.5 million, according to a statement from Christie's cited by the New York Times.

"No interpretation, no matter how subtle, can (for me) change anything about this."

He began his letter by praising Gutkind for sharing a common impulse of "striving for the improvement and refinement of existence", but soon took issue with Gutkind's religious ideals.

In the letter, Einstein turned a critical eye towards his own Jewish identity, specifically questioning the assertion that Jews were "chosen people".

"The Jewish people to whom I gladly belong, and in whose mentality I feel profoundly anchored, still for me does not have any different kind of dignity from all other peoples," he wrote.

"As far as my experience goes, they are in fact no better than other human groups, even if they are protected from the worst excesses by a lack of power. Otherwise I cannot perceive anything 'chosen' about them."

The God letter seems to outline Einstein's view of formal religion and the idea of a God who plays an active part in everyday life, answering individual prayers.

"He did not believe in a God who went around choosing favourite sports teams or people," said Walter Isaacson, the author of the 2007 biography "Einstein".

But according to experts, at other times Einstein described himself as "not an atheist" and the letter does not annul the seemingly spiritual characteristics of his thinking.