The Bible tells us that all believers have a new identity in Christ. What does that actually mean?

Does it seem to you, as it does to me, that it has become more common for our public debates to be framed as being between the “good guys” and the “bad guys”? The people on “our side” are perceived as “good,” and the people on the “other side” as “evil.” What does the Bible have to say about how we view each other?