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Philosophers and theologians have spent centuries trying to know God and establish his ‘ID card' - in vain. The only thing we do know is that we know nothing about Him. Why is this? Does each of us believe in his or her own God? ‘So who is this God you believe in?' was the question that Victor Malka, in a series of radio programmes broadcast from 2010 to 2011 on France Culture, asked Jewish philosophers, rabbis and intellectuals. What do they think of when they say ‘God'? Where do they stand as regards Creationism and Evolutionism? Why may one not pronounce God's name in Judaism? How can we answer a Holocaust survivor who, after Auschwitz, no longer believes in any God whatsoever? These are some of the questions discussed, in these pages, by thirteen figures representing different facets of Judaism today.