“Give to Caesar what belongs to Caesar and to God what belongs to God” is a well-known principle,in the West at any rate, but is it really practised? Is “secularism” still a value? How can religious and cultural confrontation be kept open in an era in which Islamic radicalism tends to clash with Christian neo-radicalism? Scholars from different backgrounds, both secular and religious, discuss these questions in this Dossier. The very fact that they discuss these issues demonstrates that diversity is not necessarily synonymous with antagonism, for themes such as secularism, the rule of law, democracy and human rights are crucial for the world as a whole, not just the West.