looked it up and technically the were suppose to be jews, the writers (probably jews) planted references that were intended to say they were jews. however; "however, paramount producers directed that any reference to the characters' jewish heritage be removed from the episode "family". they were concerned that the characters might be portrayed as comical stereotypes." so since it never appeared on screen its not canon and we can continue to assume that no, jews do not exist in the future in star trek.
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