Second Vatican Council, Lumen Gentium 16, November 21, 1964
“But the plan of salvation also includes those who acknowledge the Creator, in the first place among whom are the Muslims: these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind’s judge on the last day.”
Second Vatican Council, Nostra Aetate 3, October 28, 1965
“The Catholic Church rejects nothing of what is true and holy in these religions. She has a high regard for the manner of life and conduct, the precepts and doctrines which, although differing in many ways from her own teaching, nevertheless often reflect a ray of that truth which enlightens all men. Yet she proclaims and is in duty bound to proclaim without fail, Christ who is ‘the way, the truth and the life’ (Jn 1:6). In him, in whom God reconciled all things to himself (cf. 2Co 5:18-19), men find the fullness of their religious life.
“The Church, therefore, urges her sons to enter with prudence and charity into discussion and collaboration with members of other religions. Let Christians, while witnessing to their own faith and way of life, acknowledge, preserve and encourage the spiritual and moral truths found among non-Christians, also their social life and culture.
“The Church has also a high regard for the Muslims. They worship God, who is one, living and subsistent, merciful and almighty, the Creator of heaven and earth (Cf. St. Gregory VII, Letter III, 21 to Anazir [Al-Nasir], King of Mauretania PL, 148.451A.), who has spoken to men. They strive to submit themselves without reserve to the hidden decrees of God, just as Abraham submitted himself to God’s plan, to whose faith Muslims eagerly link their own. Although not acknowledging him as God, they venerate Jesus as a prophet, his Virgin Mother they also honor, and even at times devoutly invoke. Further, they await the day of judgment and the reward of God following the resurrection of the dead. For this reason they highly esteem an upright life and worship God, especially by way of prayer, alms-deeds and fasting.
“Over the centuries many quarrels and dissensions have arisen between Christians and Muslims. The sacred Council now pleads with all to forget the past, and urges that a sincere effort be made to achieve mutual understanding; for the benefit of all men, let them together preserve and promote peace, liberty, social justice and moral values.”
“Therefore, the Church reproves, as foreign to the mind of Christ, any discrimination against people or any harassment of them on the basis of their race, color, condition in life or religion. Accordingly, following the footsteps of the holy Apostles Peter and Paul, the sacred Council earnestly begs the Christian faithful to ‘conduct themselves well among the Gentiles’ (1P 2:12) and if possible, as far as depends on them, to be at peace with all men (cf. Rm 12:18), and in that way to be true sons of the Father who is in heaven (cf. Mt 5:45).”
Paul VI, Ecclesiam Suam 107, August 6, 1964
“Then [we refer] to the adorers of God according to the conception of monotheism, the Muslim religion especially, deserving of our admiration for all that is true and good in their worship of God.”
Paul VI, “Message to the World,” Bethlehem, January 6, 1964
“We address this reverent greeting in particular to those who profess monotheism and with us direct their religious workshop to the one true God, most high and living, the God of Abraham, the supreme God whom Melchizedek, a mysterious person about whose genealogy and end Scripture tells us nothing, and by whose regal priesthood Christ himself wishes to be characterized, one day, distinct in the past but recalled in the Bible and in the Missal, celebrated as ‘God Most High, maker of heaven and earth” (cf. Gn 14:19; Heb 7; Ps 76:3; 110:4).
“We Christians, informed by revelation, understand God as existing in the three Divine Persons, Father, Son and Holy Spirit; however, we celebrate the divine nature as one, as the living and true God. May these peoples, worshipers of the one God, also welcome our best wishes for peace in justice.
“Our greeting is also being addressed to all peoples wherever Our Catholic missions carry the Gospel, and with it an invitation to its universality and a working towards its realization.”