Within the philosophical discourse on religion in society as conducted in European and American political philosophy since the early nineties, a crucial shift occurred when the so-called “secularization thesis” was put into question: according to this criticism, today the linearity of secularization and perhaps even secularization itself, although strongly defended by a number of scholars, can no longer be taken for granted. Jürgen Habermas’ concept of “post-secularism” might be nominated as the classic example of this.