When Michael Fabius’ grandmother died in January, his three-year-old son began to have questions about God and spirituality. Fabius, 40, took his son to Congregation Rodeph Shalom to give him a Jewish perspective on death, but he also reached out to an imam, a leader in Philadelphia’s Muslim community. As co-chair of the Circle of Friends, the Philadelphia chapter of the Muslim-Jewish Advisory Council co-founded by the American Jewish Committee, Fabius is committed to giving his two children a strong Jewish foundation, but also opportunities to meaningfully engage with other Abrahamic religious. “It will be important to me that they...