Nostra Aetate sets out the Church's relationship to non-Christian religions.
Lumen Gentium make clear what the 'internal' approach of the church is.
There's a lot of debate within Christian Theology as to precisely what the consequences of Vatican II are - there's a few people who'd side with the 'non-Christian (and non-Catholic) religions are wrong' (Exclusivist) and plenty of inclusivist or pluralist theologians. I personally think the Cathechism is pretty clear as to what Catholicism is about, and it's very difficult to maintain Catholicism by saying that it's merely one of many religions rather than the 'true' path - what is significant about VII is that it explicitly states that non-Christian religions are no longer ripe for damnation, but they are mislead but good cousins to Catholicism.
I could go on at much greater length about this, but I'll spare you.