Here’s my favorite Jewish atheist joke, c/o Leo Rosten:
A brilliant young student goes to an old, learned rabbi and defiantly exclaims, “I must tell you the truth! I have become an apikoros. I no longer believe in God.”
“And how long,” asks the elder, “have you been studying Talmud?”
“Five years,” says the student.
“Only five years,” sighed the rabbi, “and you have the nerve to call yourself an apikoros?!…”
• Apikoros is a rabbinical term for unbeliever, skeptic, agnostic, atheist.