Which Europe? Which Roots? - Many believe that Europe could be or become a proper political subject only if it had an homogeneous cultural identity. The author suggests, instead, that it is useless and wrong to look for a European cultural essence as a unique basis for its political existence. In particular, it has no meaning to identify the roots of a (supposed) homogeneous European political culture in the Christian religion, and to built on it the European constitution. Modern constitutionalism has in fact lay roots which come from the Enlightment and which have been opposed through time by catholic church. The recent comeback of the modern right doctrine is an overturning of its meaning as a doctrine of individual freedom and collective self-determination. In any case, a constitution as the one Europe needs is a project of coexistenxce which does not need roots, but it must rather cut many of the existing ones.