He has featured as the key to building barriers (e.g. Heinrich Graetz and Martin Buber) or bridges (e.g. Isaac Mayer Wise and Claude G. Montefiore) in interfaith relations, as part of an intra-Jewish debate about what constitutes Jewish authenticity (e.g. Joseph Klausner and Hans Joachim Schoeps), and on occasion as a dialogical partner (e.g. Richard L. Rubenstein and Daniel Boyarin). He features in an oratorio (by Felix Mendelssohn), a painting (by Ludwig Meidner) and a play (by Franz Werfel), and there have been several novels about Paul (by Shalom Asch and Samuel Sandmel). Jewish philosophers (including Baruch Spinoza, Leo Shestov, and Jacob Taubes) and Jewish psychoanalysts (including Sigmund Freud and Hanns Sachs) have engaged with the apostle as one of the most influential figures in Western thought. Scholarly surveys of Jewish interest in Paul include those by , , , and . Gnosticism In the 2nd (and possibly late 1st) century, Gnosticism was a competing religious tradition to Christianity which shared some elements of theology. Elaine Pagels concentrated on how the Gnostics interpreted Paul's letters and how evidence from gnostic sources may challenge the assumption that Paul wrote his letters to combat "gnostic opponents" and to repudiate their statement that they possess secret wisdom. Muslim views Muslims have long believed that Paul purposefully corrupted the original revealed teachings of Jesus, through the introduction of such elements as paganism, the making of Christianity into a theology of the cross, and introducing original sin and the need for redemption. Sayf ibn Umar claimed that certain rabbis persuaded Paul to deliberately misguide early Christians by introducing what Ibn Hazm viewed as objectionable doctrines into Christianity. Ibn Hazm repeated Sayf's claims. The Karaite scholar Jacob Qirqisani also believed that Paul created Christianity by introducing the doctrine of Trinity. Paul has been criticized by some modern Muslim thinkers. Syed Muhammad Naquib al-Attas wrote that Paul misrepresented the message of Jesus, and Rashid Rida accused Paul of introducing (polytheism) into Christianity. Mohammad Ali Jouhar quoted Adolf von Harnack's critical writings of Paul. In Sunni Muslim polemics, Paul plays the same role (of deliberately corrupting the early teachings of Jesus) as a later Jew, Abdullah ibn Saba', would play in seeking to destroy the message of Islam from within. Among those who supported this view were scholars Ibn Taymiyyah (who believed while Paul ultimately succeeded, Ibn Saba failed) and Ibn Hazm (who claimed that the Jews even