Jacob Immanuel Schochet

In his book Who is a Jew Schochet, an Orthodox Jew, asserted: "There can be peaceful co-existence on the communal level, and even cooperation in matters of common concerns; but there is no common ground on the religious-doctrinal level. 'Reform' and 'Conservative' can live with 'orthodox' standards and recognize the titular status of 'orthodox' rabbis. After all, 'orthodox' rabbis are ordained on the basis of their proficiency in knowledge and adjudication of Jewish law (Shulchan Aruch). This will not work in reverse, however, because the requirements for conservative and reform ordination are altogether different."

Regarding Jews who practice Reform Judaism, Conservative Judaism, Reconstructionist Judaism, and other streams of Judaism, Schochet stated: "To be sure, we must condemn wrong and misleading ideologies and practices. But simultaneously we must be of the disciples of Aaron the High Priest: 'Loving peace and pursuing peace, loving our fellow-creatures and bringing them near to the Torah'!".

Regarding the issue of 'Who is a Jew' that arose in Israeli politics in the 1970s, Schochet was a proponent for amending the Israeli Law of Return to recognize only Orthodox conversions to Judaism, as opposed to conversions performed by non-Orthodox Jewish rabbis. He published a book entitled Who Is A Jew? on the subject, wherein he rejected the notion that Jews are a part of one race or that Jews are a nationality. Instead he stated that Jews are united by their Judaism. Schochet adhered to a definition of a Jew as "those who partook in the original covenant of the Jewish faith, which established the eternal bond between God, Torah and Israel, and those who decided to join this covenant at later stages, they and their descendants are Jews."

Schochet was an opponent of the non-profit Kabbalah Centre, accusing it of distorting the teachings of the Kabbalah. He characterized their actions as cultish practices. In 1993, the Kabbalah Centre opened a slander lawsuit in a Canadian court against him,[3] but eventually withdrew their allegation. In 2007, Schochet called the teachings of the Kabbalah Centre "rubbish"; stating, "it's phony; it's manipulative; it has no spirituality whatsoever. It's not related to the authentic Kabbalah."

Schochet responded to attacks on Chabad-Lubavitch by Haredi Rabbi Chaim Dov Keller, Talmudic scholar and rosh yeshiva (dean) of the Telshe Yeshiva in Chicago, that appeared in the Jewish Observer, and in the book of Rabbi Dr. (and Professor) David Berger, dean of Yeshiva University's Bernard Revel Graduate School of Jewish Studies and Chair of the Jewish Studies department at Yeshiva College of Yeshiva University,[4] The Rebbe, the Messiah, and the Scandal of Orthodox Indifference. Schochet attempted to demonstrate that many of the practices of Chabad they criticized were well-founded in normative orthodoxy of Jewish tradition, and other criticisms were unfounded or distorted.

In the 1970s and 1980s, Schochet was involved in anti-missionaries activities, and working with Jewish youths to bring them back to their Jewish roots. "For a Jew, however, any form of shituf is tantamount to idolatry in the fullest sense of the word. There is then no way that a Jew can ever accept Jesus as a deity, mediator or savior (messiah), or even as a prophet, without betraying Judaism. To call oneself, therefore, a 'Hebrew-Christian,' a 'Jew for Jesus,' or in the latest version a 'messianic Jew,' is an oxymoron. Just as one cannot be a 'Christian Buddhist,' or a 'Christian for Krishna,' one cannot be a 'Jew for Jesus,'" Schochet said.[5] Schochet debated missionaries, including Michael L. Brown.[6][7]

In January 2012, Schochet sent a letter to the Algemeiner Journal, expressing his "authoritative view" rejecting Shmuley Boteach's book Kosher Jesus, citing it as "heretical".[8][9][10] He wrote "I have never read a book, let alone one authored by a purported frum Jew, that does more to enhance the evangelical missionary message and agenda than the aforementioned book. The grossly distorted message of the book violates basic premises of original and authentic Jewish tradition, thus unavoidably must be rejected for being heretical. It is my sincerest hope that the author recognizes the error of his ways and looks to make amends by retracting the book".[8]

Boteach responded to Schochet stating that his ban on the book was "arrogant and un-Jewish" as well as "medieval."