The public role of religions and their relationships with institutions, the reinterpretation of the founding texts, the transmission of values in a secular world are some of the ways through which modernity challenges faiths. How do Christians and Muslims face them? Can the respective traditions still be perceived as living bodies? With contributions by: Malika Zeghal (University of Chicago), John Milbank (University of Nottingham), Yann Richard (Sorbonne). Leading article by H.Em. Card. Angelo Scola.