For the forthcoming book Abraham's Children: Liberty and Tolerance in an Age of Religious Conflict (edited by Kelly Clark), I contributed an eassy on respect. In my view the Christian faith urges equal and universal respect, and it was not hard to find support in Christian classical texts for that view, which is now generally accepted.
A surprisingly little known segment of a verse in 1 Peter, an epistle dealing more thoroughly than any other biblical text with Christian relations to non-Christians, contains an explicit command to respect all people. It says simply and straightforwardly: "Honor everyone" (2:17). I summarized the position in a post on my Facebook wall: "1 Peter says: 'Honor everyone.' 'Honor'—not merely 'don't demean' or 'tolerate,' but honor. And 'everyone'—not only 'those in our political camp' or 'with our moral persuasions,' but everyone."