'cos it is a popular area of music. Just have a read of Steve Green’s Wikipedia page and follow a few more of the links. It is a Huge genre. There are a lot of labels directly specialising in it. And many artist’s planet wide working in the field.
There is also Jesus Music - which I thought you may have been aware of
The main reason that Steve Green got his (christian singer) added was because of confusions already caused with a different Steve Green within the MB database. It is a very common name so the wrong Steve had been credited for work.
If you have been following any of @st3v3p’s edits he has been cleaning up a lot of the Christian Music from his own rather large collection. A lot of the previous data here at MB was very scrappy. I’ve been chasing down the rabbit holes with him at times and it is fascinating seeing all the connections.