That's awesome, and it sounds like a really good situation without a ton of stress. I cut my teeth on the band thing in church and play on a couple of teams currently, alternating between two churches that need bassists.
Sounds like you have a lot of available personnel, which is a good sitation to be in (oddly uncommon). What sort of songs do you play? Tomlin, Redman, Hillsong stuff or more hymn-based?