Thinking about it, I've grown up playing bass at church. Starting playing the bass because there wasn't one in the worship band at the time and there were/are too many chords and stuff to learn on the guitar. Now play at the Community Church derby playing the modern songs on a regular basis.
I believe music & spirituallity are closely linked. Music is used in many religions for achieving a mind of worship / enlightenment and can express yourself using a separate language of music rather than words.
Having said that, one thing worth pointing out is that if you do 'play' at church it doesn't automatically make you talented. It still takes, practice & time to become talented and tasteful!
The last pub/covers band I was in all played at church in the worship band and this did help on Sunday mornings. Although there is an element of performance, just on Sunday's its not about 'me'