In spite of this being an old thread, the question here is often asked by bassists. "What is the role of a bass player on a praise team?"
There is always a need for a bassist. As a bass player on a praise team, you and the drummer locked in the pocket provide the necessary rhythm and harmony foundation that the rest of the group relies on to do their parts. If the bass is out of sync with the drummer, it is an instant train wreck. From your description, it sounds like you are in a blended band and not a guitar driven band. On the praise teams where I am the bass player, there is often a piano player, lead and rhythm guitars, vocalists and an occasional flute player. To help define our roles in the group, each member via mutual agreement has a clear idea what they are going to do in the performance of a song. When I first started playing on a praise team, I was a root note bass player. Later, as I got more comfortable being in a praise team, I realized that I had a lot of control over how I defined and performed my role as a bass player. I was given a lot of leeway to create my own unique bass lines. With several instruments able to fill the low end, you have a great opportunity to create your own bass lines low, midrange and higher while still locked in with the drummer. Get creative, don't go overboard and take steps to define your role as a bass player. The organist will play that steady bass pattern against the mid to high range melody line. The lead guitar will chord and put in the riffs and the rhythm guitar will maintain that steady set of chord progressions. You are in a great position to create bass lines to play against this background of coordinated sound and by doing so, you define your part in the group.
I started with a four bass but by my second year on the praise team, I realized that I really needed a 6 string bass and the added range because I was given piano music to read for my bass lines. Well, it did not take long for me to realize that piano music bass lines more than not are written out of range for a four string bass. So, hence the six string. As I gained more experience on the six string and confidence, I began to experiment. Double stops, hammer-ons, pull-offs, slides, chords, trills, inversions, with a jazz, blues, and/or rock pattern here and there. I began to define my role as a bass player in the group. This approach has made me a better bass player and a much wanted member of the praise team. In fact, I was asked by another praise team at the same church if I could help out as bass player just last Saturday. I learned the songs by practicing at home as usual and then came for rehearsal. After rehearsing the first two songs, the music director stopped and said "We are not used to having a bass player that just comes in and plays without stopping every few measures to ask questions. You just play and it sounds great!" The drummer chimed in and said " "I love those slides, runs, and chords!" At this point I realized I had just defined myself as a bass player in this group as well. Do not view your situation as a limitation to your role as a bass player; view your situation as an opportunity to get creative and tastefully define your unique role as the bass player. And you will feel better about your role on the praise team!