As a former music minister who does read music, in my experience, it really depends on what the local church is wanting in a music program. Definitely, if the congregation desires a more sophisticated music program, they will want someone who not only reads music but who can successfully direct a choir and musicians. Besides being a song/worship leader in a small church (50ish) context, I also worked on staff at a larger church (about 500 in Sun. morning attendance). In that case, our choir director read music and at least knew technically how to direct a choir, but her people skills and ‘vision’ were poor at best, and the music program really was not helped, in my opinion, by her ability to read music. In my small church experience previous to that, because I had musicians who primarily played by ear, I found that my ability to read music had limited usefulness. It helped some, but really, in that context (church of 100), the musicians flowed well together, and except of course for sight-reading for my own benefit, I didn’t have much need to read music there. Having no musicians who read music can definitely extend the length of time regular music practice takes, however.