I agree with your friend. "Holy Ghost" has a personality to it which "Holy Spirit" lacks. I don't know koine Greek, so it may be that "Spirit" is a better translation than "Ghost." But in our culture, "Spirit" has an abstract quality which is near - fatal, while "Ghost" ( especially this One ) has nothing if not personality.
An additional argument for "Ghost" may be that progressives tend to talk about the Spirit without the Holy part, and without the Scriptures as well.
I agree with your friend. "Holy Ghost" has a personality to it which "Holy Spirit" lacks. I don't know koine Greek, so it may be that "Spirit" is a better translation than "Ghost." But in our culture, "Spirit" has an abstract quality which is near - fatal, while "Ghost" ( especially this One ) has nothing if not personality.