Due to be auctioned this week in London after being in a private collection for more than 50 years, the document leaves no doubt that the theoretical physicist was no supporter of religious beliefs, which he regarded as "childish superstitions".

Einstein penned the letter on January 3 1954 to the philosopher Eric Gutkind who had sent him a copy of his book Choose Life: The Biblical Call to Revolt. The letter went on public sale a year later and has remained in private hands ever since.

In the letter, he states: "The word god is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honourable, but still primitive legends which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this." read more at guardian.co.uk