“According to PrimeNY, Jews (or more accurately, voters with distinctive Jewish surnames) are 14% of the 3.9 million registered voters in NYC. 63% of Jewish registered voters are enrolled as Democrats and 15% as Republicans (the balance are not enrolled in a party or they are enrolled in one of the minor parties).”
https://www.jcrcny.org/resources/elections-demographics/voting-information/
I’m not enrolled as a Republican, yet I vote as one most times. You can’t go by registration. A great many register as Democrats in order to vote in the primaries. In general elections, they vote how they vote regardless of official registration.