The declaration In Our Age was posted by Pope Paul VI and the subsequently-named Pontifical Council for Interreligious Dialogue in 1965 to address and strengthen the relationship between the Christian Churches and other faiths:
In our time, when day by day mankind is being drawn closer together, and the ties between different peoples are becoming stronger, the Church examines more closely her relationship to non-Christian religions. In her task of promoting unity and love among men, indeed among nations, she considers above all in this declaration what men have in common and what draws them to fellowship. One is the community of all peoples, one their origin, for God made the whole human race to live over the face of the earth.
Current Pope Benedict XVI has called for a ‘Spirit of Assissi’ interfaith day of prayer to mark the 25 th anniversary of Pope John Paul II’s World Day of Prayer for Peace later this year:
Facing the threatening tensions of the moment, especially discrimination, injustices and religious intolerance, which today strike Christians in a particular way, once again, I make a pressing appeal not to give in to discouragement and resignation.

The Church reproves, as foreign to the mind of Christ, any discrimination against men or harassment of them because of their race, color, condition of life, or religion. On the contrary, following in the footsteps of the holy Apostles Peter and Paul, this sacred synod ardently implores the Christian faithful to “maintain good fellowship among the nations” (1 Peter 2:12), and, if possible, to live for their part in peace with all men, so that they may truly be sons of the Father who is in heaven.
~ Vatican, Nostra Aetate
Keep your conduct among the Gentiles honorable, so that when they speak against you as wrongdoing, they may see your good deeds and glorify God on the day of His coming.
~ Bible 1 Peter 2:12
“Master,” said John, “we saw someone driving out demons in your name and we tried to stop him, because he is not one of us.” “Do not stop him,” Jesus said, “for whoever is not against you is for you.”
~ Jesus, Luke 9: 49-50

Truly I tell you, people can be forgiven all their sins and blasphemies, but whoever blasphemes against the Holy Ghost will never be forgiven; they are in danger of eternal punishment.
~ Jesus, Mark 3: 28-29