I've been studying mixing 2 guitars (for recording).
I keep going to the Black Crowes as a reference. Good luck getting your soundguys to actually listen to a well mixed band. I tried it several times.
But if you can...try to find a band that sounds kind of like Your church band. The main thing I learned is "thin out them rhythm guitars - and fatten up those leads".
Blue rodeo (from Canada) is one of my other fav 2 guitar mixes.
Skynyrd had some good 3 guitar parts as well.
"How little I know inspires me tremendously! I'm a huge fan of other people's playing." Bonnie Raitt