However, with Jesus no longer regarded as the paradigm of gentile Christianity, Paul's position became more important in Jewish historical reconstructions of their religion's relationship with Christianity. 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).