I fear I do not have official document citations aside from the Catechism.
Look at it this way: To the Jews, our belief in the Trinity and in Jesus as God is very different from their strict monotheism. They could say that we worship a different God in the sense of a different idea of God. Historically, though, they’d have to acknowledge that we are an offshoot of them who claim to worship the God of Abraham and Moses under a fuller revelation.
Likewise, the Muslim view of God departs from ours (being similar to the Jews’ strict monotheism, though their idea of the human-divine relationship seems rather less warm than either Christianity’s or Judaism’s). We do not believe that they are right about God and we are wrong, or that both ideas can be true simultaneously – but as a historical phenomenon, Islam borrows a lot from Judaism and Christianity and claims to worship the God of Abraham, Moses, and Jesus. (Like us compared to the Jews, they claim a fuller revelation, but we of course disagree.)
That’s it. We acknowledge that they have some portion of the truth and are attempting to worship the God of Abraham.
Here’s what that does
not mean, though:
- Islam is actually a religion revealed by God to correct Judaism and Christianity
- Islam is actually revealed by God at all, as opposed to cobbled together from bits of previous religions
- Islam is true on any matter where its teachings differ from Christianity’s
- Islam is salvific
- Muslims do not need to be evangelized
Basically, we try to acknowledge the truths in other religions as a function of their “distance” from us. Naturally we believe that Catholic Christianity has the most of God’s revealed truth, then Orthodox Christianity, then Protestant Christianity, then Judaism, then Islam, and then you start getting into the world religions that don’t stem from the same historical root at all.
Usagi