Given recent history it's not hard to understand why many jewish people have decided there is no G-D.
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My cousin's husband's parents both survived Auschwitz, although his father is now dead. The odd thing is that his mother and her sister both survived as well, but both came out with totally opposite beliefs. His mother is an extremely devout Jew, keeping Kosher, and going to synagogue as often as her health will allow (she's in her 90s now). The experience strengthened her faith. On the other hand, her sister, in her late 80s, came out of the camps as an atheist, and she constantly bickers with, and berates her sister for "wasting her time on a G-d that doesn't exist."
Mark
Given Biblical accounts of atrocities committed against God's people, it is hard to understand why so many of them believe that This Time Is Different, and that the events of the 20th century somehow disprove God's existence.
In site of there being non-believers among us, there has always been a core of believers that has prevailed from generation to generation.
Not really. Once G-d is removed from the picture objective morality becomes impossible and nothing, not even mass murder of Jews, can be said to be objectively immoral.