It should read "You're Jewish!"
"You're" is a contraction, or a combination, of the words "you" and "are".
The word "your" is the possessive form of you, referring to something that a person has, or something that belongs to the person in discussion.
“”You’re” is a contraction, or a combination, of the words “you” and “are”.
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You really do not need the comma after the word combination.