As human beings do we at all have a common ground for dialogue and mutual understanding? Yes: what we as human beings have in common, is that we can use and understand arguments. In other words: that we are rational beings. 2. Is our capability for argumentation the only ground we have in common as the basis for dialogue and mutual understanding? There is no argumentation against argumentation. Argumentation can´t be transcended. Thus argumentation, more precisely: the capability of argumentation – i.e. reason - is the only ground we have in common as human beings. 3. Does religion play a role in this respect? Isn´t religion superfluous for a rational human being? No, not in the sense Kant has ascribed to it. To know about the boundaries of knowledge (of reason) and to humbly marvel about the miraculous existence of world, life and reason can rightly be seen as the form of religion - as the form of attitude towards the "beyond" - which is adequate (and unavoidable) for a rational being. Religion is the source of truth and ethics if it means: humble acknowledgment of the un-knowable and hence of the fact that in our search for orientation we are relegated to ourselves as fellow human beings, as brothers and sisters.
