Universalistic egalitarianism, from which sprang the ideals of freedom and a collective life in solidarity, the autonomous conduct of life and emancipation, the individual morality of conscience, human rights and democracy, is the direct legacy of the Judaic ethic of justice and the Christian ethic of love. This legacy, substantially unchanged, has been the object of continual critical appropriation and reinterpretation. To this day, there is no alternative to it. And in light of the current challenges of a postnational constellation, we continue to draw on the substance of this heritage. Everything else is just idle postmodern talk. (Jürgen Habermas – "Time of Transitions", Polity Press, 2006, pp. 150-151, translation of an interview from 1999). 

Source

Addendum (10/18)

Kai Frederik Lorentzen usefully contributes the following contextualization of the above Habermas quotation:

It strikes me as strange to see – he of all people! – Jürgen Habermas presented on your blog as a defender of the West's Judeo-Christian roots. Not that he didn't say that in 1999, but the utterance is not representative for his thinking. Habermas is not only an elitist proponent of a quick EU unification (—> United States of Europe) crashing the sovereignty of the European peoples (his idea is to legitimate that later by a referendum), he's also absolutely pro migration and does not want to know about the dangers of Islamization. In fact he's an enemy of enlightened patriotism & the idea of an Europe of nations. I've read "Strukturwandel der Öffentlichkeit", "Theorie des kommunikativen Handelns", "Moralbewußtsein und kommunikatives Handeln", "Nachmetaphysisches Denken", "Faktizität und Geltung" and others. I know the theory of Habermas, and I know his political agenda. I don't think it's an agenda you would like to support.         

Quite right. That is not an agenda I would like to support.  The quotation intrigued me, though, and I wanted to capture it for my files. I should add that I was intensely interested in Habermas in the early 'seventies around the time I began graduate studies (1973).  I read Erkenntnis und Interesse and some other things by him. But then my interests shifted to Husserl and Heidegger und die Seinsfrage and from there to classical metaphysics of Being and then to the analytic approach to existence in Frege and Russell and Quine and so I became more and more analytic and less and less Continental.  My youthful interest in the Frankfurter Schule has pretty much petered out,  except for a residual fascination with Theodor Adorno's Negative Dialektik. Also gone is  my enthusiasm for Hans-Georg Gadamer's hermeneutics whose lectures I attended when he visited Boston College in the 'seventies. My copy of Wahrheit und Methode bears his autograph.   Mesmerized by Heidegger as he was, he didn't know Husserl very well. He was surprised when I pointed out a passage in Cartesiansiche Meditationen in which Husserl speaks of a transzendental-faktisches ego. "Wooden iron!" the last student of the neo-Kantians said to me.

Here's what Habermas wrote in 2006 and in terms of religious & migration policies this still is - „Keine Muslima darf dazu genötigt werden, beispielsweise Herrn de Maiziere die Hand zu geben“ (2017) - his position today. 

> … The fourth pressing problem is the fundamentalist challenge to cultural pluralism in our societies. We have approached this problem from the perspective of immigration policy for far too long. In times of terrorism, there is a threat that it will only be dealt with under the heading of domestic security. Yet the burning cars in the banlieues of Paris, the local terror of inconspicuous youths in English immigrant neighbourhoods and the violence at the Rütli School (more) in Berlin have taught us that simply policing the Fortress of Europe is no real answer to these problems. The children of former immigrants, and their children's children, have long been part of our society. But since they are simultaneously not a part of it, they pose a challenge to civil society, not the Minister of the Interior. And the challenge we face is to respect the different nature of foreign cultures and religious communities while including them in national civil solidarity.

At first glance the integration problem has nothing to do with the future of the European Union, since every national society must deal with it in its own way. And yet it could also hold the solution to a further difficulty. The second objection of Euro-sceptics is that there could never be a United States of Europe, because the necessary underpinnings are lacking. In truth the key question is whether it is possible to expand civil solidarity trans-nationally, across Europe. At the same time, a common European identity will develop all the quicker, the better the dense fabric of national culture in the respective states can integrate citizens of other ethnic or religious origins. Integration is not a one-way street. When it is successful, it can inspire strong national cultures to become more porous, more sensitive and more receptive both domestically and abroad. In Germany, for example, the more a harmonious coexistence with citizens of Turkish origin becomes a matter of course, the better we will be able to understand other European citizens – from the Portuguese winegrower to the Polish plumber. In opening up domestically, self-contained cultures can also open up to each other.

The integration problem hits a raw nerve in European nation-states. These developed into democratic constitutional states through the forced creation of a romantically inspired national consciousness that absorbed other loyalties. Without the moving force of nationalism, the Bavarians and the Rhinelanders, the Bretons and Occitanians, the Scots and the Welsh, the Sicilians and the Calabrians, the Catalans and the Andalusians would never have merged to become citizens of democratic nations. Because of this tightly-knit and easily combustible social fabric, the oldest national states react far more sensitively to the integration problem than immigration societies like the USA or Australia, from whom we can learn a great deal. 

Whether we're dealing with the integration of gastarbeiter families or citizens from the former colonies, the lesson is the same. There can be no integration without a broadening of our own horizons, and without a readiness to tolerate a broader spectrum of odours, thoughts and what can be painful cognitive dissonances. In addition, Western and Northern European secular societies are faced with the vitality of foreign religions, which in turn lend local confession new significance. Immigrants of other faiths are as much a stimulus for believers as for non-believers.

The Muslim across the way, if I can take the current situation as an example, confronts Christian citizens with competing religious truths. And he makes secular citizens conscious of the phenomenon of public religion. Provided they react sensibly, believers will be reminded of the ideas, practices and attitudes in their Church that fell afoul of democracy and human rights well into the 20th century. Secular citizens, for their part, will recognise that they have taken matters too lightly by seeing their religious counterparts as an endangered species, and by viewing the freedom of religious practice as a kind of conservation principle.

Successful integration is a reciprocal learning process. Here in Germany, Muslims are under great time and adaptation pressure. The liberal state demands of all religious communities without exception that they recognise religious pluralism, the competence of institutionalised sciences in questions of secular knowledge and the universal principles of modern law. And it guarantees basic rights within the family. It avenges violence, including the coercion of the consciences of its own members. But the transformation of consciousness that will enable these norms to be internalised requires a self-reflexive opening of our national ways of living.

Those who denounce this assertion as "the capitulation of the West" are taken in by the silly war cry of liberal hawks. "Islamofascism" is no more a palpable opponent than the war on terrorism is a "war". Here in Europe, the assertion of constitutional norms is such an uncontested premise of cohabitation that the hysterical cry for the protection of our "values" comes across like semantic armament against an unspecified domestic enemy. Punishing violence and combating hatred require calm self-consciousness, not rabble-rousing. People who proclaim against their better knowledge that the award of the Nobel Prize in Literature to Orhan Pamuk is proof of an unavoidable clash of civilizations are themselves propagating such a clash. We should not follow in the footsteps of George W. Bush in militarising the Western spirit as well.

In Germany, the tensions between Christianity and Islam that have been mounting since 2001 recently set off an exciting, high-level competition among confessions. The subject at issue is the compatibility of faith and knowledge. For Pope Benedict XVI, the reasonableness of belief results from the Hellenisation of Christianity, while for Bishop Huber it results from the post-Reformation meeting of the Gospel with the post-metaphysical thinking of Kant and Kierkegaard. Both sides however betrayed a bit too much intellectual pride. The liberal state, for its part, must demand that the compatibility of faith and reason be imposed on all religious confessions. This quality must not be claimed as the exclusive domain of a specifically Western religious tradition. <

With best wishes! Kai Frederik Lorentzen

https://www.signandsight.com/features/1048.html
https://maverickphilosopher.typepad.com/maverick_philosopher/2018/10/habermas.html