He very clearly spoke against organized religion and dogma. However, he maintained that he himself was agnostic. He labeled atheists to be just as arrogant as religious zealots for their absolutist views.
He said he believed in “Spinoza’s God” – referring to Baruch Spinoza, a 17th-century Dutch thinker – “who reveals himself in the lawful harmony of the world, not in a God who concerns himself with the fate and the doings of mankind”.
On another occasion, he criticised “fanatical atheists whose intolerance is of the same kind as the intolerance of the religious fanatics”.
He took offense to being labeled as an atheist. Not because of his Jewish roots, but because he believed that there was a possibility of a divine creator.