I know Steven Hassan was Jewish before he joined the Moonies. But being Jewish doesn't necessarily mean that person believes in God. My parents are Jewish, I was brought up celebrating Jewish holidays which were fun, my dad is agnostic and my mum is atheist, because of her suffering at Hitler's hands. Judaism is more of a culture for them than a religious belief, my dad still goes to synagogue every Saturday, when he prays he probably doesn't think he is praying to God though.
Some people refer to Lawrence Krauss as an Atheist Jewish Scientist.
Good thread, I have met Steven Hassan before and never thought to ask him about his religious beliefs.