I've heard that the term "ghost" once had a different connotation than it does now.
It now has a connotation of the spirit of a dead person.
I've heard that it once basically just meant "spirit".
Thus, "Holy Ghost" would mean the same thing as "Holy Spirit".
Anyway, I think a lot of churches don't put NEAR enough emphasis on the Holy Spirit/Holy Ghost.
Plus, I keep hearing people IN CHURCHES referring to the Holy Spirit/Holy Ghost as "it".
Basically, they are referred to God as "it".