The nuns used to call singing "twice praying". Some truth to that I think. Nothing elevates the soul like 'gettin' down' in a song that moves you. I am not a christian person anymore but nothing, short of nothing, moves me more that singing Amazing Grace at a doings (funeral, whatever. I was once in a bar no less, and we were having a sing along. That song came up. The only person who got upset was the bartender, the rest of the place had an experience singing it. Ok, that's weird but it happened.