I am not a philologist or linguist, but I believe that our words and vocabulary do shape our attitudes and behaviour.
Fro example, in society, when words like negro and gentile are not used in everyday speech, perhaps that is a sign of progress of racial integration.
As long as words like kafir, and murtad are used to describe other people, we will not be able to see each other as fellow human beings but as "us" and "them".
In personal use, instead of using terms like "Christian", "Muslim" or "Buddhist", perhaps we should use phrases like "Seeker of Truth", "Follower of the Way", "Lover of God". It actually makes a difference! I actually said those phrases out loud, and there was a difference in my attitude, my reaction, my spinal cord, my posture.