Vatican II, Dogmatic Constitution on the Church (Lumen Gentium)
16 (cf. Catechism of the Catholic Church 841):
"The plan of salvation also includes those who acknowledge the Creator, in the first place amongst 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."
Vatican II, Declaration on the Relation of the Church to Non-Christian Religions (Nostra Aetate
"The Church regards with esteem also the Moslems. They adore the one God, living and subsisting in Himself; merciful and all-powerful, the Creator of heaven and earth, who has spoken to men; they take pains to submit wholeheartedly to even his inscrutable decrees, just as Abraham, with whom the faith of Islam takes pleasure in linking itself, submitted to God."