Through most of its history, Christians have held their noses in the air about competing religions. Theirs is the only true god and everyone else’s is just something made up in the human mind. However, that has not been true of all Christians all the time.
The link points to three approaches by Christians to other religions. The three are called exclusivism, inclusivism and pluralism.
Exclusivism is the one that comes to mind as the public face of Christianity. It is that there is but one legitimate faith and all others are made up frauds.
Inclusivism is a bit more sophisticated. It tells us other faiths have a role to play in seeking the truth. They assist by presenting gods and values where they can be parked for a while. Other faiths are only stopping points on the path to the truth faith which is Christianity.
Inclusivism, then, is a kind of recruiting tool. Be kind, or appear kind, to those of other faiths and wait for an opening to tell them about Jesus. It sounds similar to Paul who instructed followers to pretend to be of other faiths while recruiting followers.
Pluralism, treating other faiths as completely legitimate partners to Christianity is what I think of when I think of the liberal or progressive branches of Christianity.
This branch of the faith is discarded by conservatives, of course, because it is contrary to long standing exclusivity. There is no room in the inn for those of false teaching.