Congregation B’nai Jeshurun, a large synagogue on the Upper West Side of Manhattan, is known for its charismatic rabbis, its energetic and highly musical worship, and its liberal stances on social causes.

But on Friday, when its rabbis and lay leaders sent out an e-mail enthusiastically supporting the vote by the United Nations to upgrade Palestine to a nonmember observer state, the statement was more than even some of its famously liberal congregants could stomach.

“The vote at the U.N. yesterday is a great moment for us as citizens of the world,” said the e-mail, which was sent to all congregants. “This is an opportunity to celebrate the process that allows a nation to come forward and ask for recognition.”

The statement, at a time when the United Nations’ vote was opposed by the governments of the United States and Israel, as well as by the leadership of many American Jewish organizations, reflected a divide among American Jews and a willingness to publicly disagree with Israel.