Well, to make a long story short, Lenny Bruce was Jewish!
Since Lenny Bruce's mother was Jewish, and in Orthodox Judaism and Conservative Judaism, those with a Jewish mother (or those who underwent a halakhic conversion) are considered Jewish, then that makes him Jewish. His father was Jewish too.
Lenny Bruce (whose full birth name was Leonard Alfred Schneider) was born on October 13, 1925 in Mineola, New York, United States.
He was an American stand-up comedian, social critic and satirist. He was renowned for his open, free-style and critical form of comedy which integrated politics, religion, sex, and vulgarity.
If you see any details that require update, please Let us know!