Kind of an off the wall question, but even though this song is in the key of G, you use a G7 to lead to a C chord in measure 2. I guess that’s OK due to the circle of fifths, where a G7 -> C, but I’m curious why there’s never a D7 leading back to a G in this set of backup material. All of your D chords seem to be straight up D chords. Is that because this is a hymn? Is there some kind of rule that says stay away from V7 -> I chord progressions in hymns?