That simply is not the point.
If my appalachian hillybilly relatives ask me if I'll bring some RCs and Moonpies home in a poke, I either know their language or I don't.
This guy had worked there at SA for a while and refused to speak their language. The correct answer was "Yes, I'm a Christian."
The Salvation Army is a charity that operates as an evangelical effort of Christians.
The Salvation Army is a church denomination, just as Methodist, Baptist, Presbyterian, Catholic, etc., that operates charity works.