They're starting a church in our town and the wifing unit and I are, essentially, the choir. We both are decent in the "voice" and "knowing a fair bit of church music" department, but a little lacking in the "practical musicianship" department. That is to say, I'm really bad at looking at a piece of music and singing it or accurately producing, say, a G given that somebody else is singing an E. The bar of musicianship needed is relatively low: the music used is generally fairly technically simple in rhythm, melody, and harmony (unless you want to dig into the Chaikovsky).
But, hey, I already know the difference between Dorian and Phrygian and what tritone substitution is, if that counts for anything (and: viiº7 is sol-less). Not to mention, of course, being able to actually read music even if I can't faithfully reproduce it vocally. But, yeah, the both of us will have to work on this.
Drat, I've been avoiding being an actual part of a choir and learning this kind of junk for years. It's the domain of NERDS.