“From the 1970s onwards, the presence of numerous Muslim families has increasingly become a distinguishing mark of this country. Constant effort is needed in order to foster better mutual acquaintance and understanding. Not only is this important for peaceful coexistence, but also for the contribution that each can make towards building up the common good in this society.Many Muslims attribute great importance to the religious dimension of life. At times this is thought provocative in a society that tends to marginalize religion or at most to assign it a place among the individual’s personal choices. The Catholic Church firmly advocates that due recognition be given to the public dimension of religious adherence. In an overwhelmingly pluralist society, this demand is not unimportant. Care must be taken to guarantee that others are always treated with respect. Mutual respect grows only on the basis of agreement on certain inalienable values that are proper to human nature, in particular the inviolable dignity of every single person. Such agreement does not limit the expression of individual religions; on the contrary, it allows each person to bear witness explicitly to what he believes, not avoiding comparison with others.
Dear friends, on the basis of what I have outlined here, it seems to me that there can be fruitful collaboration between Christians and Muslims. In the process, we help to build a society that differs in many respects from what we brought with us from the past. As believers, setting out from our respective convictions, we can offer an important witness in many key areas of life in society. I am thinking, for example, of the protection of the family based on marriage, respect for life in every phase of its natural course or the promotion of greater social justice.This is another reason why I think it important to hold a day of reflection, dialogue and prayer for peace and justice in the world, as we plan to do on 27 October next, twenty-five years after the historic meeting in Assisi led by my predecessor, Blessed Pope John Paul II. Through this gathering, we wish to express, with simplicity, that we believers have a special contribution to make towards building a better world, while acknowledging that if our actions are to be effective, we need to grow in dialogue and mutual esteem.”
— Pope Benedict to Muslims in Germany, 23 September 2011
Also, read the text of the Muslim welcome to him.