I use a Dr-05 for
and I can say, without fear of contradiction, that the internal mics pretty much suck. I've only used them once, because it was in an outdoor amphitheater with security nearby so I was stuck using them. If that's all you have, then that's all you have, but definitely use pretty much any external mic if you can. If you haven't placed your Church order yet, there are other, faster, mic options that are just as good and similarly priced. Naiant and Sound Professionals come to mind.
Other than that, I love my Dr-05. The battery life is mind-blowing. I only change batteries out for the hell of it, not because they've run down. The Pelican 1030 micro case holds it perfectly, too.