"Call Down a Blessing", which is a version (Susan/WYSIWYG tells me) of "Brendan's Shield).

This song is definitely a spirit=filled, but nondoctrinal song, and easy (and necessary) to draw the audience/congregation into. They pick up what's necessary very easily, even if they've never heard it before. Being nondoctrinal, it should work in almost any faith environment you could throw at it.

Dave Oesterreich